ᐅ Controlled residential ventilation: Is an air gap under the doors necessary?

Created on: 3 Mar 2016 13:57

Hello everyone,

we are building with a central controlled ventilation system for the living spaces. I have heard several times that the interior doors need to be trimmed by about 1 cm (0.4 inches) after installation to allow sufficient air circulation.

Is this true? And if the doors are trimmed, the bottom edge will be “open,” without any coating or edge banding. Is that not a problem?

How is it handled in your experience?

Neige4 Mar 2016 10:19

#13

If controlled residential ventilation works the way you describe, why all the fuss about trimming door panels?
You're right, Sebastian, I wouldn’t want such a huge gap either.

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Mycraft4 Mar 2016 10:27

#14

Yes, I’m not sure what the problem is either... our door panels have not been shortened... the frames are fully foam insulated... there is a maximum gap of 5mm (0.2 inches), yet the mechanical ventilation with heat recovery works perfectly...

tomtom794 Mar 2016 14:50

#15

What kind of gaps do you have under your door? For us, it’s at most 5mm (0.2 inches), if not even less.

A small cent visibly stuck between the floor and the door threshold, gap measurement around the door area.

There is even a plastic edge under the door as far as I can see.

The door frame is sealed with silicone towards the tile. I think it looks better like this than without.

White door frame edge meets dark floor tiles, corner between wall and door opening.

Sebastian794 Mar 2016 14:52

#16

If there really is a rubber seal, that would be a pretty poor design choice for a mechanical ventilation system with heat recovery.

tomtom794 Mar 2016 14:55

#17

It is plastic, just checked again, probably to protect the bottom edge of the door, for example, against water.

One004 Mar 2016 22:59

#18

WildThing schrieb:
Did you do that yourselves? And in that area, is there really no expanding foam or anything, but it’s completely open? How satisfied are you with your solution?

Routed out with a router. It goes very quickly and, in my opinion, doesn’t noticeably affect the stability. There is no expanding foam up there since we only applied foam insulation locally around the doors. I can’t see any advantage in fully foaming the door frames because they’re already very sturdy as they are. Satisfied? I personally can’t detect any difference in sound transmission compared to the same doors without this overflow opening in the basement.

ᐅ Controlled residential ventilation: Is an air gap under the doors necessary?

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