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Head, or header:
the horizontal frame member at the top of the window.

Head expander: a u-shaped piece of vinyl used as filler on the head of a window.

Heat-absorbing glass: also called tinted glass, is treated to absorb heat and light radiation and to reduce glare.

Heat treated glass: glass that has been treated to improve its strength. The two types of heat treated glass are Fully Tempered (FT) and Heat Strengthened (HS).

Hermetically sealed glass: double or triple glazing which is sealed to prevent entrance of air and moisture and to prevent escape of the insulating gas inside.

Hopper windows: windows that are hinged at the bottom so that the window opens inward from the top.







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