Frost against ventilation in my house. Now I think what to do in winter?

I just made ventilation in the basement of the house, and thought: "but did you do it at all?" ...

Is that the seemingly difficult thing about ventilation?

Need air supply and exhaust. That's the whole system.

Only when everything starts to work, nuances appear.

And winter is a great time to test the system for performance.

1️⃣ Initially, I put a check valve at the outlet of the exhaust duct. And it immediately became clear that he would not work for us.

All condensate that flowed out of the ventilation duct froze at the outlet, and simply did not allow the "curtain" of the check valve to open.

2️⃣ The slope of the vent channel proved to be correct.

I made it with a slope outward, which is why all this condensation flowed out. Otherwise, all the water would be in the basement.

3️⃣ But there were problems with the supply channel.

From immediately became a source of condensation, and from the outside.

And the more severe the frosts were, the more abundantly the ice cap grew.

The solution here is simple — it is insulation.

I insulated the vertical part of the channel from the inside to protect the foundation slab through which the ventilation channel passes from freezing.

I also plan to wrap it outside, but the question still arises:

What about the frosty air that enters the basement?

• Of course, the inflow can be reduced without affecting the overall atmosphere of the room.
• Or make an inflow from the inside of the house. But too warm air is also not needed in the basement.

Thus, I am at a dead end, and I am waiting for your advice.

How and where to make the correct ventilation supply duct to the basement? Especially if you have experience, share in the comments.

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