Half screen This type of screen does not fill the entire opening of a double-hung, single-hung or half-slide window. It only covers one sash.
	Half-panel This is a type of door that has panels on one half (usually the bottom half) and a glass insert on the other half.
	Half-round A half-round window has the 180 arc of a halved circle.
	Hallmark certification Hallmark certification for windows and doors is earned from the Window and Door Manufacturers Association (WDMA). It is considered to be a mark of excellence among architects, contractors and other specifiers, and is accepted industry wide.
	Handhewn This texture gives doors a weather-worn look. It's created by planning channels of various sizes into the smooth surface of a door’s stiles, rails and panels. The areas between the smooth surface and channels are then hand-sanded for a visually pleasing transition between the different surface depths.
	Handing A term describing the swinging direction of a window or door. Window or door hardware may also be left or right-handed.
	Handle set A generic term given to the components that attach to the face of a sliding door panel, handle sets allow the door to be opened and closed.
	Hardboard A board material manufactured of wood fiber, refined to form a panel. Hardboard has a density range of approximately 50 to 80 pounds per cubic foot. Created under carefully controlled combinations of pressure, heat and moisture hardboard has a characteristic, natural ligneous bond.
	Hardwood One of the botanical groups of trees that has broad leaves in contrast to the needle-like leaves of conifers or softwoods. Hardwoods are usually deciduous, shedding their leaves in the fall or at the end of each growing season.
	Head Jamb The horizontal frame member at the top of a window or door assembly.
	Headboard This is a flat board cut to fit the contour of a bow or bay window and installed between the head jambs and the flat wall surface to finish off the area that would normally be ceiling.
	Header A header is a heavy beam extended across the top of the rough opening for a window or door, resting on the jack studs to support the weight of the wall above the unit.
	Header Track The track in the head jamb of a sliding/gliding window or door that guides the sash/panel as it opens and closes.
	Heat gain This is the transfer of heat from outside to inside by means of conduction, convection, and radiation through all surfaces of a house.
	Heat loss Heat loss is the transfer of heat from inside to outside by means of conduction, convection, and radiation through all surfaces of a house.
	Hemlock This type of wood features a fine-textured, straight-grained appearance. It has a light, even color that ranges from yellow to brown. Hemlock stains beautifully and will not darken over time. The wood is also free of pitch and is not likely to splinter.
	Hickory Hickory is a relatively smooth hardwood with prominent grain, and it frequently features character marks such as bird pecks, pin knots and mineral streaks. It has a dramatic color variation that can be minimized with darker stains or paint finishes.
	High-altitude glass This type of glass prevents window panes from bowing in higher elevations. It includes breather tubes (placed between the panes of insulating glass) to equalize the airspace pressure with the atmosphere. High-altitude glass is recommended for altitudes above 4000 feet.
	Hinge A jointed or flexible device on which a door or window turns. The earliest known hinges were T-shaped devices called strap or cross-garnet hinges. They were made of wrought iron with a crossbar fixed vertically to the door frame, and attached with nails to the door. In the 18th century, hinges for interior doors were H-shaped or L-shaped, and attached to the door with nails.
	Hinge Track The part of a bar hinge that allows the pivot point of an awning or casement sash to slide as the window opens and closes.
	Hollow Core Flush Door A flush door with a core assembly of strips or other units of wood, wood derivative or insulation board, that supports the outer faces and has intervening hollow cells or spaces.
	Hopper window See basement window.
	Horizontal Gliding Window Two or more sash that slide horizontally past each other; one or more of the sash may be fixed or inoperative or all the sash may operate; in a closed position, the sash come together to form a vertical meeting rail.
	Horizontal Lite A lite or cutout that extends from stile to stile of a sash or panel.
	Horizontal sliding window This type of window has one stationary sash and one sash that moves to the right or left in grooves or on tracks.
	Hygrometer An instrument that measures relative humidity in the air.
	Hygroscopic Readily taking up and retaining moisture.
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