Definitions
U-factor - A measure of total heat flow through a window or door barrier
from room air to outside air. Lower numbers indicate greater insulating
capabilities.
R-Value - A unit of thermal resistance used for comparing insulating values
of different materials. The higher the R-Value of a material, the greater its
insulating properties and the slower the heat flows through it.
Low-E - A coating consisting of a very thin layer of metallic oxide or silver which is
applied to the third surface of an insulating glass unit to block radiant heat transfer
and ultra-violet rays. Low-E coating on a window pane lets light in, yet reflects heat
and keeps harmful UV rays out in the summer and keeps heat inside during the winter.
Argon Gas - An odorless, colorless, tasteless, non-toxic gas which is six
times more dense than air. It is used to replace air between the glass panes
to reduce temperature transfer between the outside and inside pane of glass.
Krypton Gas - Inert gas known for its ability to provide insulating properties
in a small air space. A nontoxic gas used in insulating windows to reduce heat transfer.
Internal Grids - Horizontal or vertical bars applied to the interior of the window glass
for the purpose of design.
