GLOSSARY-H

 

HEADER.

The upper horizontal member of the main frame of a door, or a window frame.

 

HEAT ABSORBING GLASS.

(Tinted glass) – Window or door glass tinted chemicals that absorb light and heat radiation. Heat absorbing glass also reduces glare and brightness. The shading coefficient ranges between 50% to 70%.

 

HEAT TRANSFER COEFFICIENT.

(U-value) – The U-value denotes the rate of heat flowing through a construction. This is expressed in units of ‘Buth per square foot of surface per degree F. difference between indoor and outdoor air temperature.’ Numerically, this is equal to the ‘inverse of the sum of R-values’ for construction.

 

HINGE.

A joint that enables windows to swing open.

 

HORIZONTAL SLIDING WINDOW.

These types of windows slide in a horizontal fashion.

 

HUNG WINDOW.

These windows contain at least one hanging sash.

 

HYGROSCOPIC.

Windows that ‘give off’ and ‘take on’ moisture. One example of the hygroscopic property would be the exposure of wood to changes in relative humidity of air.