Head - The horizontal top portion of the main frame.
Head expander - A vinyl shape cut the width of a product and placed on the head, fitting over it snugly. This piece is used as a filler to expand or lengthen the unit from the head and take up the gap in the opening between the unit and the opening in the unit.
Hook accessory - Accessories that snap to the hook frame and provide easy installation.
Hopper - A window with a bottom-hinged sash that opens inward for ventilation.
I.G. Unit (Insulating Glass Unit) - Two or more lites of glass separated by a spacer and hermetically sealed at the glass edges.
Intercept® Spacer System - Spacer system using a U-channel design to reduce the number of conduction paths.
J-channel - Integral extension on the outside of a new construction window that eases installation on siding applications.
Jamb - Vertical sections of the main frame.
Keeper Rail - The horizontal section of the sash where the keeper is attached.
Keeper Stile - The vertical section of the sash where the keeper is attached.
KeepSafe® glass - Specially designed glass where two panes of glass are bonded to a durable plastic interlayer, providing increased safety, UV protection and noise reduction. If the window gets broken the glass will adhere to the plastic interlayer - preventing glass fallout in the home. KeepSafe® is a registered trademark of Monsanto.
Krypton Gas - An inert, odorless, colorless, tasteless, non-toxic gas which is about 12 times more dense than air. It is used to replace air between the glass panes to reduce temperature transfer and deter convection. Used when a higher performance is desired than that produced with Argon gas.
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