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Question:

The check valve on the air pipe is installed in front of the fan and is there any difference in the back (direction is correct)?

Answer:

Installed in front of the wind blowing, the top open check valveIt is difficult to install the check valve, which is installed on the rear by the force of air suction.

The principle is feasible, but the opening is definitely lagging behind, it will lead to poor ventilation, it is not recommended.AskOh, well, I see. I'll put him in the front. But in this case due to installation problems, only to fan up.

Yes。Installed in front of the wind blowing, the top open check valveIt is difficult to install the check valve, which is installed on the rear by the force of air suction.