Features of exhaust fans with check valve

Every room needs forced ventilation for the comfort of the people living inside, especially the kitchen and bathroom. Many users do not know in what cases exhaust fans can be installed and what power they should be. Manufacturers of such equipment sometimes offer an exhaust fan with a check valve to solve all the problems that arise due to the specific nuances of the use of these rooms.

Exhaust fan manufacturers

To make life comfortable, different companies produce modern technology, instruments, and devices. And for many buyers, the company’s face, its reputation and recognition are the decisive selection criteria. Others do not want to overpay on brands, but are looking for reliable suppliers. The best exhaust fans in 2021 presented:

• Ballu is a trademark owned by the multinational company Ballu Industrial Group. It specializes in climate control engineering technology, with which it has entered the world market since 1990. The main office is located in Hong Kong, production plants in Japan, Korea, Russia, China, Lithuania, Poland. The equipment began to arrive on the Russian market in 2003, its representative office is Rusklimat.
• Auramax is a Russian brand of products for ventilation systems, these include household fans, grilles, inspection hatches, etc. The main difference is the combination of affordability with quality workmanship, modern design. The materials are characterized by a long service life and high wear resistance due to protection against overheating.
• Erre is an Italian company producing high-tech climate control equipment. Experience in this area has exceeded 70 years. In 1995, the ISO 9001 quality certificate was awarded. The official dealer is the Vencon company. The last decade of activity has been aimed at popularizing the Italian approach to business and design.
• Vortice is an Italian climate control company that has been supplying reliable, high-quality ventilation equipment for over 60 years. The emphasis is on aesthetics. Representative offices have been opened in different countries to expand borders.
• Vents is a large Russian company of climate control equipment, selling an assortment of millions of units. In production, international quality standards are taken into account. Thanks to this, the brand is a member of the association of climate industry experts. Founded in the 90s of the last century, since then 16 large workshops have been opened.
• ERA is a large domestic company producing climate control equipment, which began its activities in 1997. At first, production was aimed at producing modular ventilation systems; the company was called Ecovent LLC. Today the range includes about 1,300 items, and sales volume reaches 30 million units.
• Cata is a Spanish company producing kitchen hoods and industrial ventilation systems. It began its activities back in 1947. In a short time, it has become famous throughout the world for its air purification technology. Full company name – CataElectrodomesticos SL
• Diciti is a brand of high quality commercial/industrial fans owned by ERA. The company was founded in 1997. A series of products is created according to unique designs by leading designers. In addition to aesthetics, the manufacturer focuses on innovation.
• Soler & Palau is a well-known Spanish manufacturer of fans. Blagovest is the representative in Russia. Factories are dispersed in other countries - the USA, China, Europe, India. Founded in 1951. Since 1987, products have been certified according to ISO-9001 standards, since 1989 - ISO-9001/2000.
• Electrolux is a Swedish company of household and professional appliances founded in 1919. Initially engaged in the production of kerosene lamps, then quickly became a leader, retraining in another industry. The annual production volume is more than 60 million units. All products are sold to 150 countries around the world. The main slogan is “Made wisely.”
• Blauberg is a popular manufacturer of ventilation equipment from Germany. There are 7 factories located in different parts of Europe. The volume of produced equipment exceeded 100 million units. The brand successfully balances between the aesthetic, quality, and functional characteristics of its models.

Device design

The check valve for all similar devices for home use is made of plastic. The specific design of the check valve is widely used in various exhaust systems for various rooms and kitchen hoods. It is based on the principle of operation of butterfly wings: during flight they are straightened, and the rest of the time they are folded. Two equal halves reliably shut off the air supply inside the room after the fan stops working using special springs - they are opened by the blown mass of air.

This design, along with obvious advantages, has some disadvantages:

• opening the valve flaps consumes engine energy, so the fan efficiency decreases slightly;
• The valve flaps do not have sufficient tightness.

But in everyday life, such a fan copes with all duties perfectly.

Exhaust Fan Rating

Properly designed and installed ventilation equipment guarantees clean air, absence of humidity, condensation and the ensuing consequences. The overhead type is distinguished not only by shape and size, but also by quality and functional characteristics. Experts assessed each nominee on a group of criteria:

• Productivity – air exchange rate;
• Dimensions – compliance with the geometric dimensions of the ventilation shaft area;
• Diameter – from 80 to 200 mm;
• Safety – protection from moisture, shock, overheating, power surges;
• Noise level – recommended no higher than 35-55 dB;
• Additional options – humidity sensor, motion sensor, timer;
• Installation method: surface-mounted, built-in, ceiling;
• Type of design – axial, radial, centrifugal;
• Materials – quality, resistance to external influences, wear;
• Design – classic, modern innovative models;
• Control method – electronic, remote, automatic start/shutdown.

Only the most popular models that meet the needs of customers were included in the review. After analyzing the reviews, the magazine's editors determined the advantages and disadvantages of each nominee and compared the stated characteristics with the real ones. This helped to weed out products with inflated promises and short service life.

The best thermostats

TOP 10 best offers

It is important to buy a good fan that is ideal in terms of technical characteristics and design for your bathroom. You can install and connect the device yourself.

Therefore, we offer you the best ten silent models on the market. The rating list includes the best-selling and popular devices from Russian and foreign manufacturers with a check valve. Over the past year, these are the models most often purchased from online stores and offline supermarkets specializing in the sale of home appliances.

Place #1 – ERA FAVORITE 4C-01 16 W

The exhaust device of the domestic brand is equipped with a durable ABS plastic body with good resistance to ultraviolet radiation. An aerodynamically shaped impeller provides a high level of performance and reduced background noise.

The unit is equipped with a spring-loaded check valve with two flaps. This element prevents reverse draft from the main ventilation duct and prevents extraneous unpleasant odors from entering the room.

Technical specifications:

• type of mechanism - axial
• at what speed does air exchange take place – 95 m3/hour
• power characteristics – 16 W
• control option - mechanics
• number of speed modes – 1
• useful extras – with power cable and switch
• background sound – 35 dB
• weight – 0.55 kg

Despite the high base power and the ability to quickly remove unpleasant odors, smoke and strong aromas from the room, the unit is moderately noisy and consumes a minimal amount of electrical energy.

Stable and high-quality operation is ensured by a modern ball-bearing motor with a progressive overheating protection system during operation.

Rubber gaskets reliably protect the interior of the case and electronic components from moisture, direct splashes and drops. Installation is carried out in an overhead manner. The block is inserted into the air outlet channel and fixed on top with screws.

Users have no complaints about the model. The unit behaves most effectively in small bathrooms, showers and other small sanitary and hygienic premises.

Place #2 – HELIOS M1/100

An elegant and stylish exhaust fan from a famous German brand belongs to the premium segment of household appliances. It has an attractive and stylish appearance, saves energy and is quiet during operation.

Effectively removes excess moisture, unpleasant odors, smoke and intrusive aromas from the room. It has two speed modes: standard and enhanced. When the second one is activated, it changes the musty air into something fresher and more pleasant to breathe in 3-5 minutes.

Technical specifications:

• type of working mechanism – axial
• air exchange rate – 90 m3/hour
• power – 9 W
• control principle – mechanical
• speed limit – 2
• important additions - moisture-proof housing, UltraSilence technology, which ensures silent operation even with accelerated rotation of the fan blades
• noise level – 30 dB
• weight – 0.8 kg

The exquisitely laconic design of the external panel is one of the main advantages of the unit. Thanks to this, the exhaust fan fits harmoniously into any interior design of a bathroom, shower room or toilet. Users also note the almost silent operation of the fan and reasonable energy consumption with high air exchange efficiency.

I really like the ability to change the speed mode from standard to turbo for faster removal of intrusive aromas and unpleasant odors.

As a minus, customers highlight only the high cost of the product, which significantly exceeds the prices for similar domestic products.

Place #3 – ERA COMFORT 4C 16 W

The unit with a check valve compares favorably with similar devices with its eye-catching design. The ventilation hole is located in the center of the facade, covered with a curved plastic grille. Despite such an unusual configuration, the device is not inferior in efficiency and performance to standard-style modules.

The exhaust fan is available in white. Therefore, a model is chosen when it is successfully combined with the existing decorative design.

The facade panel does not require complex and painstaking maintenance. It can be easily removed, washed under running water using a delicate plastic cleaner, dried and quickly put back in place.

Technical specifications:

• type of mechanism - axial
• at what speed does air exchange take place – 95 m3/hour
• power characteristics – 16 W
• control option – mechanical
• number of speed modes – 1
• useful additions - protection against overheating
• background sound – 35 dB
• weight – 0.5 kg

Endurance and high performance allow the device to be used for both periodic and continuous ventilation of bathrooms, toilets and showers.

The device is mounted in air exhaust shafts or ventilation lines. Demonstrates high performance and is ahead of many of his classmates in this parameter.

The company is positioning it as a premium option, but is sold at a reasonable price. Has a branded five-year warranty and is serviced in certified service centers.

Place #4 – ERA SLIM 4ET 14 W

The Slim exhaust fan differs from similar products in its record thin front panel. It looks elegant on the wall and adds modernity and style to the room. Suitable for both periodic and permanent maintenance of bathrooms, toilets and showers.

A spring-loaded check valve with two flaps made of ABS plastic prevents unpleasant odors from entering the room from the common ventilation shaft.

Technical specifications:

• type of working mechanism – axial
• air exchange rate – 90 m3/hour
• power – 14 W
• control principle – mechanics
• speed limit – 1
• important additions – timer, maximum operating temperature 40 °C
• noise level – 39 dB
• weight – 0.5 kg

The low background noise level allows the unit to be installed in small apartments and city studios, where the bathroom is adjacent to the bedroom and living room.

Despite its ultra-thin design, the exhaust fan works very efficiently and quickly removes all unpleasant odors from the room. The internal engine has good endurance and can easily withstand intense operating loads.

Modern ABS plastic is used to produce the housing, impeller and front panel of the fan. Thanks to its durability and specific physical characteristics, the device looks good and performs its functions clearly throughout the entire period of use.

Place #5 – Soler & Palau SILENT-100 CZ DESIGN

An elegant and stylish device from the famous Spanish manufacturer looks neat in the interior. The internal motor is attached to the body using rubber-metal bushings. They soften vibration and neutralize noise effects.

The single-phase electric motor is equipped with ball bearings, operates without interruption and does not require maintenance throughout the entire operating period.

The exhaust fan with a flat outer panel is convenient and practical. It is very easy to keep in order. If stains or dirt appear on the facade, they can be quickly removed with a microfiber cloth and a delicate detergent.

Technical specifications:

• type of mechanism - axial
• at what speed does air exchange take place – 85 m3/h
• power characteristics – 8 W
• control option - mechanics
• number of speed modes – 1
• useful additions - IP45 safety class, high-endurance ball-bearing motor, specially shaped protective grille that reduces noise effect
• sound background – 26 dB
• weight – 0.65 kg

Impeccable build quality, elegant appearance and high performance are the main advantages of the unit. It consumes a minimum of electricity and quickly changes the air in the room.

It functions normally at temperatures up to +40 °C, has a high waterproofing class and built-in thermal protection.

The model’s body is completely sealed and completely prevents water drops, splashes and moisture from getting inside. The check valve reliably protects the room from the penetration of unpleasant odors and aggressive aromas from the outside.

Place #6 – Vents 100 LD 14 W

The household unit with laconic lines and shapes is presented not only in the traditional white color, but also in black, red, blue, and green shades. This makes it possible to use the fan as a useful technique and a striking decorative element.

The housing, impeller and outer panel are made of advanced ABS plastic. It is resistant to the external environment, easily tolerates direct ultraviolet radiation and maintains a presentable appearance throughout its entire service life.

Technical specifications:

• type of working mechanism – axial
• air exchange rate – 88 m3/h
• power – 14 W
• control principle – mechanics
• speed limit – 1
• important additions - waterproof housing
• noise level – 36 dB
• weight – 0.6 kg

To ensure that the device stays firmly on the outlet of the air shaft and does not vibrate during operation, all joints and connections must be very carefully sealed with silicone. For additional reliability, you can use clamps and mounting tape.

During installation, the exhaust module can be connected to an individual external switch or the system can be configured so that the fan is activated simultaneously with the lighting in the bathroom, shower or toilet.

The equipment kit includes four screws. With their help it is very easy and convenient to attach the housing to the wall surface.

Place #7 – VENTS 100 QUIET-STYLE 7.5 W

The compact unit with a flat outer panel and a shortened pipe is suitable for installation in a ventilation shaft and allows connection to air exhaust communications.

In the output part of the device there are innovative air stream rectifiers. They reduce the level of turbulence, increase the overall air pressure and significantly reduce the noise effect that occurs during operation.

Technical specifications:

• type of mechanism - axial
• at what speed does air exchange take place – 90 m³/hour
• power characteristics – 7.5 W
• control option - mechanics
• number of speed modes – 1
• useful additions - multi-level cabinet moisture protection
• background sound – 26 dB
• weight – 0.66 kg

The household appliance has built-in effective moisture protection class IP 45. All electronic elements are carefully sealed and are not afraid of accidental contact with water drops, condensation or splashes.

Customers note the stylish appearance of the device, good moisture resistance and simplified installation as advantages. Opinions were divided regarding the noise level.

Some users say that the model sounds stronger during operation than previous versions. Other owners claim that you quickly get used to the sound and it stops irritating your ears.

Place #8 – Blauberg Sileo 100 7.5 W

The stylish, powerful and durable device fully complies with all international standards for household equipment. Quickly sucks out aggressive aromas from the room.

Thanks to the presence of a check valve, it prevents unpleasant, intrusive odors from getting inside.

Before hitting store shelves, household exhaust fans undergo mandatory testing. In this way, manufacturing defects are identified and the possibility of the client purchasing initially faulty products is negated.

Technical specifications:

• type of working mechanism – axial
• air exchange rate – 90 m³/hour
• power – 7.5 W
• control principle – mechanical
• speed limit – 1
• important additions - double class of insulation from external influences, compliance with IP45 standards
• noise level – 25 dB
• weight – 0.6 kg

A modern engine that ensures normal operation of the fan is mounted on special dampers. They absorb vibration without transmitting it to the device body. This helps to significantly reduce background noise.

For the manufacture of the housing and impeller, the manufacturer uses modern high-strength plastic. This material is not afraid of temperature changes, maintains the integrity of the structure, does not creak or turn yellow during operation.

Place #9 – MMOTORS MM 100

The Bulgarian company MMOTORS has large production facilities and produces household appliances using modern German equipment.

The brand's products are sold in Russia, the European Union and the Middle East. The combination of optimal price and excellent quality makes ventilation devices popular and in demand in the consumer market.

The model is equipped with a compact but powerful engine. Immediately after switching on, it systematically renews the air in the room and creates a comfortable atmosphere, not spoiled by strong odors.

Technical specifications:

• type of mechanism - axial
• at what speed does air exchange take place – 60 m3/h
• power characteristics – 16 W
• control option - mechanics
• number of speed modes – 1
• useful additions - electric motor from the Japanese concern NSK, encapsulated ball bearings
• background sound – 27 dB
• timer - no

This ultra-thin fan from a popular Bulgarian brand is unpretentious to environmental conditions and can operate at temperatures up to +100 °C. The design does not include a check valve.

The device is connected to a standard single-phase network. Has a European certificate of compliance with the established parameters.

Place #10 – AURA DiCiTi 4C MR

The low-noise, optimally powerful unit correctly serves the bathroom, shower or toilet. It operates in one speed mode, is not afraid of intense loads and does not require maintenance.

The exhaust fan is equipped with a progressive timer. This useful option allows the user to schedule in advance the moment when the equipment is turned on to create a comfortable and pleasant atmosphere in the room.

Technical specifications:

• type of working mechanism – axial
• air exchange rate – 90 m3/hour
• power – 8.4 W
• control principle – mechanical
• speed limit – 1
• important additions - spring-loaded double-leaf check valve, modern motor with reduced sound effect, shortened flange, lead-free electronic components
• noise level – 25 dB
• weight – 0.7 kg

The device body is equipped with additional rubberized inserts. They absorb vibration, effectively dampen background sounds and seal the internal space, preventing accidental splashes or drops of water from entering there.

The Fusion Logic controller is a multi-mode timer and makes it possible to control the module according to an individually selected program.

Which exhaust fan is better?

To buy an exhaust fan for the kitchen, bath, shower and other rooms with insufficient oxygen circulation, you first need to find a reliable manufacturer. Next, compare the potential with the service area, the price with the approximate service life. Based on a comparative analysis of the advantages and disadvantages of each nominee, the experts summed up the following review results:

• Ballu Green Energy GE-150 – a basic model with an optimal balance of characteristics;
• Auramax Optima 5C is a universal compact device of domestic production;
• Erre Cromo 12/5 – expanded functionality, automatic operation of the check valve;
• Cata E-100 G – panel design, compliance with international standards;
• Diciti AURA 4C – quiet due to the motor on ball bearings, light weight;
• Soler & Palau Silent-200 CHZ Design 3C – powerful air exchange, reliable assembly;
• Cata X-Mart 10 Inox H – stainless steel panel with LED lighting, hygrostat.

If you only need to perform the main task - filtration and purification of oxygen, you can look at an inexpensive device from the rating with a basic set of options. For connoisseurs of innovation, smart devices that can operate without owner intervention are suitable. It is important to familiarize yourself with the characteristics, pros and cons, and reviews of previous customers in advance.

Reasons for installation

Over time, natural ventilation can no longer cope with the tasks assigned to it, because no one cleans the shafts of old houses, they become clogged, and their efficiency leaves much to be desired. If many users install an exhaust system for the kitchen so that odors do not spread throughout the apartment while cooking, then why not install a bathroom fan with a check valve? After all, in the bathroom and toilet we often observe such negative nuances:

• unpleasant odors leak from the ventilation system shaft;
• there is no normal draft - as a result, the air stagnates;
• there is no flow of fresh air due to a clogged ventilation shaft of the building;
• Mold begins to appear in the corners - this is a clear reason for increased humidity due to poor ventilation.

If, after taking water treatments, condensation remains on the tiles in the bathroom, and the humid air remains for a long time, this is a signal that the ventilation urgently needs to be improved . To do this, you can install an ordinary exhaust fan, which will forcefully remove moist air from the room, but it will not solve the problems with the unpleasant smell from the mine - only fans with a check valve will help here.

Remember! Mold and mildew form quite quickly, but removing them is a very big problem, requiring investment of money and your efforts.

Treating all problem areas with chemical components is only half the battle; until you install a household fan for high-quality exhaust of stagnant air, you will not solve these problems. In addition, it is necessary to ensure a normal flow of fresh air for the toilet and bathroom, otherwise all efforts will be in vain. Therefore, you should not make the doors completely airtight - air must somehow flow into these rooms for better ventilation.

Colibri 100 – inexpensive among household ones

Lightweight, inexpensive axial type exhaust fan. Designed for air exchange in the toilet or bathroom, kitchen. Ventilates a dressing room, bathhouse or sauna. Mounted overhead in the ventilation duct, fastened to the wall using self-tapping screws.

The use of flexible air ducts is provided when the distance along the length is limited. Can be installed in a suspended ceiling. The device is operated in continuous or periodic mode. The fan is unpretentious and does not require special maintenance.

• Lightweight, inexpensive, optimal power for a bathroom or toilet.
• Price, easy installation.
• Low noise level.

Ventilation duct arrangement

For private houses, the ventilation system is simple: a channel in the form of pipes is led to the roof or connected to a hood. If the house is made of wood, then even such ventilation is not required. After all, the walls are able to “breathe”, so they easily let air into the room.

For apartments, the situation is complicated by the fact that everyone in the entrance is connected to a single ventilation duct. The lower the location of the apartment, the greater the likelihood that the channel will clog faster.

Ventilation duct in the wall

To check the quality of ventilation, you can hold a lit match to the ventilation hole. If the light does not move or moves very weakly, then the ventilation is not working well.

If the channel is clogged, it is necessary to provide forced ventilation. Such artificial ventilation is provided by installing a fan in the room. It is built into the air exchange system (ventilation shaft opening). When choosing a fan, it is necessary to take into account the fact that the device will be operated under conditions of high humidity.

Forced ventilation in a residential building

Vents 100 LD Fresh Time – decorative panel with a clock

A fan with an unusual design solution - a decorative panel with a built-in quartz clock has been added. Installation is carried out directly into the ventilation shaft. The possibility of installation in a flexible air duct is provided.

The device is designed for periodic or continuous operation. The electric motor develops high speeds and is economical. An axial fan is used for air exchange in small rooms.

• The presence of a watch is an interesting and practical design solution.
• Low cost, quality workmanship.
• Does not creak, does not make noise, fully performs its functions.

• It is not equipped with a check valve, I had to buy it separately.

Purpose of indoor ventilation

The practical importance of ventilation for the bathroom is enormous. If it doesn't work well, mold may appear.

Only timely removal of overheated humid air allows you to avoid the appearance of condensation under the ceiling and on the walls.

Just where condensation appears, mold nests soon form. Cosmetic repairs will only temporarily eliminate the problem, but will not solve it completely .

Also, if the ventilation is of poor quality or incorrect operation:

• the air is oversaturated with harmful substances;
• carbon dioxide concentration increases;
• there is a feeling of mustiness and dampness;
• dust and other allergens accumulate;
• body tone deteriorates;
• apathy appears and overall performance decreases;
• weakens the immune system;
• Due to the appearance of condensation, tiles glued to the plasterboard substrate may come off.

Installation of equipment

Today, almost each of us can install a ventilation structure independently. For successful completion, you need to take into account literally a few useful tips:

Installation

• You need to make sure that the common air shaft is not clogged; if the answer is negative, then it should be cleaned.
• It is best to create a small gap under the door for reliable traction or install a grill on the doorway.
• The success of ventilation directly depends on properly selected equipment. Therefore, it is necessary to take into account the performance of the fan, its safety and functionality in advance.
• Exhaust models must discharge atmospheric masses into a common air outlet channel through a special opening. This technological opening is located in every apartment, as it provides natural ventilation.
• Before starting installation, you need to install a wire for power supply.
• Installation of ventilation is carried out only strictly according to the instructions from the manufacturer, which describe all the subtleties of the process.

Era Comfort 4 100 mm – interior solution

Exhaust fan with a cute design that fits into any room interior. Equipped with a protective grille. Made in moisture- and dust-proof design. Device type – axial. Attached to a flat surface with the ability to be recessed into the ventilation duct.

Power supply is from a single-phase electrical network of 220 volts. A mechanism is provided to protect the electric motor from overheating. Sliding bearings are used. The current state of the structure is indicated by a light indicator.

• Nice modern appearance, fits perfectly into the bathroom interior.
• Equipped with a check valve.
• Low noise, no louder than a regular refrigerator.

• It is not supplied with electrical wires and components necessary for connecting to the electrical network.

RVS Sirius 100 – with protective mesh

Household axial fan for creating air exchange in the toilet, bathroom, kitchen. Equipped with a protective grille and fine mesh to prevent insects from entering from the ventilation duct.

The overhead housing has a rectangular shape, which ensures reliable installation to the wall with a tight fit to the surface of the mounting plane. Moisture-resistant materials are used. The device is economical. Power supply – stationary single-phase electrical network.

• Simple, convenient, easy to install.
• The presence of a protective grille and fine mesh.
• Economical, fast air exchange.

• For automatic operation from contact sensors, you need to buy the necessary electronics.

RVS Electra 125 – channel

Supply and exhaust fan of duct type. Mounted in a ventilation shaft or round air duct. High-quality moisture-resistant ABS plastic is used. The electric motor is designed for long-term operation and is economical.

The device is used in a bathroom, shower or bathroom, kitchen, and other small rooms. The operating principle is axial. It has a simple design, is unpretentious, and does not require special preventive maintenance work.

• Duct, convenient to install in a round air duct.
• Economical, can work without interruption for several hours.
• Performance, low noise, good quality plastic.

• No negative properties were noted by consumers.

TDM 100 SQ1807-0201 – People's series

Wall series fan. It is used to remove polluted air from small domestic premises. Power supply: 220 volt network. The device is classified as People's. Installed in a ventilation duct with fixation to a wall, partition, suspended ceiling or ceiling.

Proper weight distribution, durable blade materials with a certain degree of plasticity, made it possible to achieve acceptable efficiency while maintaining performance. Has low noise.

• A household axial fan that fully performs its basic functions.
• Lightweight design, easy installation, unpretentious.
• Cute, low noise.

• The check valve must be purchased additionally, as well as the electronics for automatic operation.

Blauberg Aero Vintage 125 – performance

Exhaust axial fan with increased performance. It is used in medium and small premises: domestic and civil premises, kindergartens, catering establishments, medical institutions.

The design is made in an interesting vintage design that fits into any interior. The rotating parts are perfectly balanced, which makes the fan quiet during operation.

• Interesting antique design.
• Excellent performance.
• Makes little noise during operation.

Despite the high performance, steam removal requires 5

How to accurately determine a clogged ventilation duct

It is necessary to check the effectiveness of natural ventilation in winter. For this we will need:

• open the windows;
• attach a piece of paper to the ventilation hole;
• The leaf should be pressed against the hole by the air flow.

Checking ventilation using a sheet of paper
If the paper does not hold well or even falls off, the ventilation is poor. A more accurate method is to test using a clear cellophane tube and a lit cigarette. To do this, the pipe must be attached to the ventilation hole. A lit cigarette is brought to the open end of the pipe. The speed of smoke movement will indicate the effectiveness of ventilation. Knowing the dimensions of the cylinder, the ventilation performance is calculated.

If the draft is poor, you can try to clean the ventilation pipe yourself with a special brush.