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Airtightness is the fundamental building property that impacts infiltration and exfiltration (the uncontrolled inward and outward leakage of outdoor air through cracks, interstices or other unintentional openings of a building, caused by pressure effects of the wind and/or stack effect). [2]
Building openings such as garage doors and windows are often weak points susceptible to failure by wind pressure and blowing debris. Once failure occurs, wind pressure builds up inside the building resulting in the roof lifting off the building. Hurricane shutters can provide protection.
A pet door (also known as a cat flap or dog door) is an opening in a door to allow pets to enter and exit without the main door's being opened. It may be simply covered by a rubber flap, or it may be an actual door hinged on the top that the pet can push through.
The latest officially released version of MasterFormat is the 2018 Edition, which uses the following Divisions: PROCUREMENT AND CONTRACTING REQUIREMENTS GROUP:
Revolving door is flanked on both sides by conventional doors with arrows pointing inward towards the preferred entry. H. Bockhacker of Berlin was granted German patent DE18349 [ 7 ] on December 22, 1881 for Tür ohne Luftzug or ' Door without draft of air ' , which used a rotating cylinder with a door which after entering, the user then turned ...
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