Are the corners of both the frame and sash fusion welded?
	Is durability designed in with double walls or internal screw bosses for mounting hardware?
	Do the vinyl profiles have a smooth, high-gloss finish that simulate a "freshly painted look"?
	Does the glass have adequate insulating air space, thermally improved spacers, a low-e coating and other features that improve performance?
	For hung windows, can the sash be tilted in and lifted out for easy cleaning?
	Has the frame and sash material been tested for color stability and impact resistance?
	Are test reports available to validate the window's resistance to wind, air and water leakage?

Windows
Numerous window styles exist. Here are descriptions of some popular styles:

	Double-hung Window—This style has operating upper and lower sashes that move vertically in grooves. A lock is centered on the meeting rails.
	Single-hung Window—Similar to the double-hung, but only the lower sash is operational.
	Single or Double Sash Sliding Window—Unlike the single- and double-hung window, the operating sash or sashes slide horizontally on a track. Either one or both sashes can slide.
	Casement Window—Hinged on its side, top and bottom, a casement window has locking levers on the opposite side, securing the sash against air infiltration. Quality casements crank open via sliding arms.
	Awning Window—These windows incorporate a double side-hinged operable sash and provide excellent ventilation.
	Bay Window—These are configured with three or more windows, side-by-side, projecting in a polygon-like shape from a house. Typically, they are 30° and 45°, with three lites.
	Bow Windows—Similar to bay windows, they are composed of four or more windows of the same size, side by side, that project in the shape of an arc from a house.
	Fixed Windows—This term describes any window that doesn't open. The most popular fixed window is a rectangular "picture" window. However, fixed windows are available in a number of configurations such as round, half-round, quarter-round, hexagonal and triangular.

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