Air permeability
Wooden windows and exterior doors - Designing the frame-sash connection
Article REF: C3611 V1
Air permeability
Wooden windows and exterior doors - Designing the frame-sash connection

Author : Marcel DENANCÉ

Publication date: February 10, 2003 | Lire en français

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1. Air permeability

1.1 General

Controlling air permeability depends on controlling the clearance between the sash and frame. As explained in paragraph 1 of the previous article [C 3 610] , there is residual permeability at the sash-frame connection, which must be as low as possible.

As a function of pressure, air flow (m 3 /h) is given by :

Q Δ p = K · Δ p n

with :

K
 : 
...
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