E - Fixed Constructions – 06 – B
Patent
E - Fixed Constructions
06
B
E06B 7/14 (2006.01)
Patent
CA 2319400
A hollow window frame structure is provided with a one way valve to permit flow from the exterior of the building to the interior of the building through the hollow frame when the air pressure is higher outside than in the interior of the building and impair flow from the interior of the building to the exterior of the building when the air pressure in the interior of the building is higher than the exterior pressure.
Marzen Artistic Aluminum Ltd.
Rowley C.a.
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