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HYPALON

A synthetic, vulcanizable rubber manufactured by reacting polyethylene plastic with chlorine and sulphur dioxide.

HUMIDITY, RELATIVE

The percentage of moisture in the air in relationship to the amount of moisture the air could hold at that given temperature. 100% relative humidity would be rain. The amount of degree of moisture in the air.

HORIZONTAL SLIDER

A window where the moveable panel slides horizontally.

HERMETICALLY SEALED UNIT

An insulating glass unit made up of two lites of glass, separated by a roll formed aluminum spacer tube (at the full perimeter) which is filled with a moisture absorbing material. The unit is then completely sealed, creating a moisture-free, clean dead air space.

HEEL BEAD

Compound applied at the base of channel, after setting lite or panel, and before the removable stop is installed, its purpose being to prevent leakage past the stop.

HEAT-STRENGTHENED GLASS

Glass which is reheated, after forming, just below melting point and then cooled. A compressed surface is formed which increases its strength. Used for spandrel glass.

HEAT LOSS

The transfer of heat from inside to outside by means of conduction, convection, and radiation through all surfaces of the house.

HEATING DEGREE DAY

Heating and cooling engineers have found a way to relate the typical climate conditions of different areas to the amount of energy needed to heat and cool a building. The term they use is “Degree Days” using a base temperature of 65° F. A heating degree day is counted for each degree below 65° reached […]

HEAT GAIN

The similar transfer of heat from outside to inside. Both heat loss and heat gain are measured in terms of the fuel consumption required to maintain a comfortable indoor temperature.

HEAD OR HEADER

Upper horizontal member of the master frame of a window, patio door, or entrance way.