A Glossary of Replacement Windows Terms for the Homeowner



	Vinyl Windows
	Wood
	Aluminum
	Wood Clad
	Fiberglass
	Casement
	Bay or Bow
	Awning Windows
	Double Hung
	Skylights
	Egress Basement
	Grades of Glass
	The Big Picture
	Defining Style
	Glossary of Window Terms

	Replacement Window Ratings
	Comparisons

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The head is at the top of a window and is the horizontal portion of the main window frame.

A head expander is usually a u-shaped piece of vinyl placed on the head of a window to be used as filler. This piece will expand or lengthen a unit and fill a gap.

Hermetically sealed windows are completely sealed against the escape or entry of air.

A hook accessory connects to the hook frame for easy installation.

A window with a bottom hinge that opens inward for ventilation is known as a hopper.

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