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Please use our glossary to help become more familiar with the words, terms and phrases commonly found and used in the screens, windows and doors industry. You may either display the set of terms by A-Z or use our search form below to look for a particular term.
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| Hairline Joint |
| The fine line of contact between abutting members with the maximum joint width limited to 1/64". |
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| Hand Of Door |
| The designation for describing the direction a door swings. Visualize your back to the hinge or pivot jamb. If the door swings right, it is a right-handed door. If the door swings left, it is a left-handed door. |
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| Hardware For The Physically Challenged |
| Hardware designed specifically to accommodate the needs of the physically challenged and to provide for ease of operation and accessibility. |
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| Haze Factor |
| The percentage of light through a glazing material that is not diffused. (A 100% haze factor would equate to 100% of the light being diffused. |
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| Head |
| The upper horizontal member of a window frame. |
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| Head Expander |
| A U-shaped extrusion slipped over the frame head that, when pushed up, closes the gap between the frame head and the opening head after window installation. |
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| Head Or Header |
| The horizontal frame member which forms the top of a frame. |
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| Heat Fusion |
| (welding) method to join PVC frame and/or sash members by heating the cut ends, squeezing them together, and allowing the assembly to cool. |
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| Heat Gain |
| The transfer of heat from outside to inside by means of conduction, convection, and radiation through all surfaces of a house. |
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| Heat Loss |
| The transfer of heat from inside to outside by means of conduction, convection, and radiation through all surfaces of a house. |
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| Heat Treating |
| The process where glass or aluminum extrusions are heated and cooled to make these materials harder and stronger. |
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| Heat-Absorbing Glass |
| Window glass containing chemicals (with gray, bronze, or blue-green tint) which absorb light and heat radiation, while reducing glare and brightness. Also see Tinted glass. |
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| Heat-Strengthened Glass |
| Glass that has been heated and quenched in a controlled operation to provide a degree of surface compression. ASTM Standard C 1048-85 specifies that the surface compression be between 3500 and 10000 psi. Generally considered to have two times the strength of annealed glass. |
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| Heating Degree Day |
| Term used by heating and cooling engineers to relate the typical climate conditions of different areas to the amount of energy needed to heat and cool a building. The base temperature is 65 degrees Fahrenheit. A heating degree day is counted for each degree below 65 degrees reached by the average daily outside temperatures in the winter. For example, if on a given winter day, the daily average temperature outdoors is 30 degrees, then there are 35 degrees below the base temperature of 65 degrees. Thus, there are 35 heating degree days for that day. |
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| Heavy Glass |
| glass used in many European-style frameless enclosures. Usually 3/8-inch or 1/2-inch in thickness. |
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| Hermetically Sealed Unit |
| An insulating glass unit (IGU) that is sealed against moisture. The unit is made up of two lites of glass, separated by a roll-formed metal spacer tube (at the full perimeter) which contains a desiccant (moisture and/or solvent absorbing material). The unit is then completely sealed, creating a moisture free air space. |
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| HERS |
| Home Energy Rating System. A California home energy rating certification program. |
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| High-Impact Acrylic |
| Glazing material which has an impact modifier blended with the acrylic resin to meet specific impact requirements. |
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| Hinge |
| A hardware device that connects a sash to a frame and enabling it to swing open or closed. |
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| Hinge Backset |
| Depth of the hinge leaf that is mortised into a door stile or doorjamb. |
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| Hinge Door |
| a shower door that usually has a jointed metal hinge on the side of the door. |
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| Hinge Reinforcement (Back-Up Plate) |
| A metal plate attached to the door and/or doorframe to receive a hinge. |
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| Hinge Stile |
| The vertical structural member of a door to which the hinges are attached and about which the door pivots. |
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| Hinged Windows |
| Windows (casement and awning) with an operating sash that has hinges on one side. See also Projected Window. |
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| Hip |
| The intersection between two sloping surfaces forming an exterior angle. |
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| Hollow Extrusion |
| A tubular extrusion having an enclosed cavity within it. It is usually stronger, although more costly, than a solid extrusion. |
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| Hopper |
| Window with a sash hinged at the bottom. |
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| Horizontal Slider |
| HS have two or more sash (panels) within a frame. They may have one moving and one fixed sash (XO or OX), two moving sash on either side of a fixed sash (XOX), or two adjacent sash may slide by each other (XX). Most have rollers to ease operation. |
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| Hung Window |
| A window in which the operating sash move up and down within the master frame. The weight of each operating sash is counterbalanced with balances to permit easy operation. |
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