What is the purpose of installing a check valve on the air duct in front of the exhaust fan?

Check valves. It refers to a valve that automatically opens and closes the valve disc by relying on the flow of the medium itself to prevent the medium from backflowing, also known as check valve and check valve.

Reverse flow valves, and back pressure valves.

The check valve is an automatic valve, and its main function is to prevent the backflow of the medium, prevent the pump and the drive motor from reversing, and the discharge of the container medium.

The valve of the horizontal check valve can be stored in a dry and ventilated place indoors, which can be moisture-proof, rain-proof and rust-proof. It should be closed when transporting, and its disc should be fixed in the open position, the diameter.

Foam boards are used for the inner openings at both ends.

Blocked, the port must be plugged tightly with a stuffy cover, and the check valve of the air duct should be installed to prevent dust and rust, and keep the channel clean and the end face smooth.

Horizontal check valves should be placed smoothly and should not be squeezed against each other, and should be checked regularly when placed for a long time. Bathroom exhaust fans.

Installation method 1: The ceiling exhaust fan has a good appearance and can be installed on the ceiling of the bathroom. The ventilation fan has a short duct, so it is necessary to purchase a ventilation duct to match the duct when installing.

2. The wall-mounted exhaust fan is small in size and can be embedded above the wall, but due to the narrow cross-section of its exhaust outlet, the ventilation strength is weak, so it is only suitable for installation in the bathroom with a small area. 3. The window exhaust fan is different from the first two, it has a single and double two-way operation, which can not only discharge the indoor air, but also supplement the outdoor fresh air to the room, therefore, the window exhaust fan has a larger scope of application and better effect.

To determine whether it is installed on the ceiling or on the wall, choose different models of exhaust fans according to different installation positions. Installed on the aluminum gusset ceiling.

The exhaust fans are equipped with metal fasteners matching the ceiling keel, which is very convenient to install; The exhaust fan installed on the wooden keel ceiling only needs to be connected to the exhaust pipe and tighten the exhaust fan panel with wooden screws.

If you want to install it on the external wall of the bathroom, you should first make a hole in the wall, and the diameter of the hole should be determined according to the size of the air outlet diameter of the exhaust fan you purchased; Or install it on the wall of the exhaust pipe reserved in the bathroom, then you need to be equipped with a check valve to prevent the smell of other people's homes from stringing to your home, and the wall installation generally requires an impact drill.

Punch holes, expand screws.

Fixed. Precautions for the installation of toilet exhaust fans 1, ventilation fans should be placed horizontally: ventilation fans should be placed horizontally, pay attention to not tilt when using, and check whether the power supply of the socket is consistent with the parameters on the fan nameplate when using.

2. Try to get as close as possible to the original air duct tuyere. The shortest pipeline principle. 3. Try to get as close as possible to the location where the odor and moisture are generated.

The principle of maximum efficiency. 4. It should not be installed directly above the shower site, otherwise the airflow will make the body feel uncomfortable, and when the temperature is low, the heat loss will be large. 5. Combined with ceiling modeling, blocking, lighting, etc., the aesthetics are considered unified.

A check valve is installed on the duct in front of the exhaust fan to prevent air from backflowing.

In order to effectively prevent the backflow of airflow, the exhaust fan rotates in one direction.

That's to make the air in the room easier to ventilate and also blow out.

To make it easier to ventilate the air in the room, avoid the wind going back into the house.

It is to make the air circulate normally, because it is in the same direction, there will be a reverse flow phenomenon.

The Aryans who entered India brought with them a new cultural system, which (sometimes called Vedic by its sacred name) was the origin of classical Indian culture.

We will certainly be able to achieve the desire for economic acceleration to which Mr. Modi referred.

Effectively prevent the state of air backflow, because his exhaust air is in one direction.

The purpose of installing a check valve on the air duct in front of the exhaust fan is to prevent backflow of air.

In order to prevent the exhaust fan from blowing in after it stops, the wind blows in the opposite direction.

Yes, that is to add a fan page, when exhausting, use wind to open, and close when there is no wind, and the principle on the range hood is the same, that is, a plastic plate.

Check damper installation location:

In the exhaust system with a standby fan, a check air valve is installed on the air duct at the suction end of the fan;

In the air supply system with a standby fan, a check air valve is installed on the air duct at the outlet end of the fan;

The outlets of multiple system exhausts are merged into the same air duct, and a check air valve is installed on the main air duct of each exhaust system.

The check damper shall comply with the following requirements:

1. The opening and closing are flexible, and the closing should be tight;

2. The rotating shaft and hinge of the valve blade should be made of materials that are not easy to rust to ensure flexible and durable rotation;

3. The strength of the valve plate should ensure that it is not bent and deformed under the maximum load pressure;

4. The horizontally installed check air valve should have a reliable balance adjustment mechanism.

Near the air outlet of the exhaust or smoke exhaust pipe, the check air valve is generally not installed for fresh air or make-up air.

We can find that the ventilation and smoke check valve and the control valve are quietly installed together, and the control valve is in front, and the check valve does not affect the function whether it is installed in front of the valve or behind the valve. Precautions for the installation of check valve 1, the check valve is a one-way valve, so the installation position, height, and inlet and outlet direction must meet the design requirements with hail, and the direction of medium flow should be consistent with the direction of the arrow marked on the valve body. 2. Before installing the check valve, the appearance should be checked, and the nameplate of the valve should comply with the provisions of the current national standard "General Valve Mark" GB 12220.

It can only be used after passing the standards. 3. Do not let the check valve bear the weight in the lack of slag in the pipeline, especially the large check valve, which should have independent support and not be affected by the pressure generated by the pipeline.

A check valve is added directly to the air duct of the outdoor exhaust to prevent negative pressure and air backfilling in the room on windy days.