Did you know that a bathroom fan puts an end to natural ventilation?

Should I install a fan in the toilet and bathroom? Natural ventilation is not sufficient in most cases. Especially in summer. That is why it is impossible to do without a fan. But what happens when we install them? Let's figure it out.

One ventilation shaft is provided for ventilation of the toilet and bathroom. This means that fans will constantly move air from the toilet to the bathroom and then back again. To avoid this, valves are installed. However, after such manipulation, I heard complaints more than once: “until you turn on the fan, there is no draft at all”. In fact, the problem lies on the surface.

Natural ventilation is closed by a non-return valve. It has a normally closed execution, i.e. in the initial position - closed. While the fan is running, the valve is open. As soon as we turn it off, the valve closes.

With good natural draft, the valve will of course open. With low traction, you can forget about natural ventilation. For myself, I found a solution. Perhaps it will be useful to someone else.

To restore natural ventilation, I decided to slightly alter the valve itself. Move it from a normally closed to a normally open position. It turned out to be easy to do.

Drilled three holes in the moving part of the valve. I screwed in the screws, the heads of which are directed against the balance. Putting in a few washers, I achieved the desired bolt position. At the same time, the efficiency was preserved.

If you blow on the valve from the counterflow side, it closes. Let me show you how it looks in practice. It is not convenient to blow and shoot. Used a hairdryer. I switched on the first speed. Aimed at the valve from a distance of half a meter.

There is one limitation! Due to such modifications, fan noise may increase. It depends on the speed of the air passing through the duct, which in my case did not become a problem. I made myself virtually silent ventilation. If you are interested, I will write a separate article about this.

That's all for me. Thanks for reading. If the article was helpful, subscribe to the channel and of course put your thumbs up 👍.