ᐅ Jamb Ventilation – How Large Should the Air Gap Be?

Created on: 2 Dec 2019 11:16
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Reini1234
Hello everyone,

We have installed a controlled residential ventilation system Wolf CWL 400, and I want to create a transom ventilation horizontally, above the door leaf.

How many millimeters do I need to mill out over a length of 80cm (31.5 inches) to allow the required air volume to pass through? Is there any calculation formula for the air cross-section?
Mycraft6 Dec 2019 09:56
@Reini1234
What more can I say about this? It is basic HVAC knowledge. If you plan to have closed doors, you need to provide transfer grilles or similar elements.

The airflow between rooms in the supply air, transfer air, and exhaust air zones of a house or apartment must not be blocked by closed interior doors. All rooms must have non-lockable and properly sized transfer openings. These passages become necessary in systems where air is supplied to the rooms from outside through outdoor air inlets (decentralized) or via supply air vents (centralized).

How these are implemented is up to the homeowner or the contractor. Whether the gap under the existing door is sufficient can be calculated or determined from tables/diagrams.
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Reini1234
9 Dec 2019 23:18
How does it work with my bedroom and dressing room? Essentially supply and exhaust air in one space but with different airflows. Can I omit the frame ventilation there?
opalau9 Dec 2019 23:30
The difference between supply and exhaust air will still flow nevertheless…