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Air-Leakage Rating Air leakage can occur around windows, doors, floors, roof coverings and any entry or exit point for pipe work or other utilities. Between 25% to 40% of energy costs can be attributed to air leakage. Typically, a calibrated fan measuring air flow and pressure on different parts of a building can establish an air-leakage rating. This is known as a blower door test.
Annealed Glass Annealed glass is ordinary glass that has been heat-treated to make it less susceptible to cracking and shattering under heat or impact shocks. The structure of glass contains many chemical bonds that not only provide its strength, but also make it brittle. These internal stresses can be reduced by annealing, which results in a stronger product that is useful in tough environments.
Annealing Annealing is a physical process that can be applied to many solids including glass and metal. Normal manufacturing processes place a material's internal chemical bonds under a lot of stress. This can cause the material to become brittle and susceptible to cracking, shattering, and breaking. By heating up the finished product to just under its melting point, these stressed chemical bonds can rearrange themselves to release some of the stress. In turn, the material becomes tougher and less susceptible to temperature and physical shocks.