ᐅ Central ventilation system — is it advisable to install it in the basement as well?

Hello everyone,

Our basement is partially built into a slope. At the rear, this creates three basement rooms, where the central unit of the controlled residential ventilation system is also located.

The rooms are not heated. Each room has a basement window.

Is it common or advisable to supply fresh air ducts to the basement rooms as well?

Thanks in advance,
Christian

We have exhaust air in the laundry room and supply air in the hobby room, despite having basement windows! My neighbor does not have basement windows but instead has controlled mechanical ventilation in the basement. So yes!

Why do you ask?

Our installer said that nothing really needs to be done and it would be sufficient to leave a stub open on the manifold.

He also mentioned that in an unheated room, moisture could form due to the supply of warm air. This point actually seems logical to me, as moisture condenses on the cold surfaces from the warm supply air.

Regards

I overlooked the fact that the basement is not heated. What does Aunt Google say?

LuckyDuke schrieb:


He also mentioned that supplying warm air into an unheated room could cause moisture buildup. That actually makes sense to me, as moisture from the warm supply air condenses on the cold surfaces.

Regards

Why are these rooms unheated, and why supply air? Normally, in basements, there is also a controlled mechanical ventilation system. Living spaces receive supply air, and other rooms have exhaust air.

So something in your planning doesn’t seem right!

Using controlled residential ventilation for an unheated basement is generally not advisable. Fresh air supply is excluded for the reasons mentioned, and exhaust air alone inevitably causes negative pressure, which then draws air from the living area—at the latest when the basement door is opened—and you end up back at the fresh air supply problem.

Provide the basement with decentralized, separate ventilation.