Hood with check valve

An extractor hood with a check valve was needed in the bathroom on the ventilation system to prevent reverse draft of air. A backflow hood is a type of exhaust ventilation that is used to remove air from a room, such as a kitchen or bathroom, and prevent air from the outside environment from flowing back into the room. The check valve (sometimes called a check damper or check valve) is located inside the hood and opens when the hood is running, allowing air to escape. When the hood is turned off, the check valve closes to prevent backflow of air and prevent outside odors or unwanted substances from flowing back into the room through the hood. This ensures more efficient and hygienic room ventilation.
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Video sections (chapters):
0:00 Introduction
0:37 Hood with check valve "Styl"
1:31 Installing a check valve
2:23 Installation of a fan with a check valve
9:00 Electrical connection
11:03 Checking the operation of the hood
11:49 Conclusion
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And in this video you will see the boiler leaking from below (What to do) • Потек бойлер снизу (Чт...
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[@user-tk2ls4is5c]

Вытяжка с обратным клапаном нам помогла остановить обратную тягу воздуха.

[@user-re3jz6gn8v]

Это надо же было догадаться на пену посадить там наверное все слиплось

[@adults_and_children]

Если пены немного, то вытяжка с обратным клапаном будет работать нормально.

[@user-re3jz6gn8v]

А как рассчитать кол во пены? И как потом это всё обслуживать? Не совсем технологично но работоспособно