The orientation, size, and nature of vents in screened exterior wall systems are important to wall performance because these characteristics affect venting, ventilation and pressure moderation. The ventilation of screened wall systems has received very little attention in Canadian building research. With funding from CMHC 's External Research Program, the B uilding Enginee ring Group at the Uni versity of Waterloo undertook an experimental and theoretical study of vents and venting in screened walls.
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