Glossary of Terms

HOPPER	Window designed specifically with the handle to the inside and top. The most traditional form of a basement window. The advantage of a hopper in basement window applications is that it provides maximum ventilation and protection against the elements even when opened.
DOUBLE SLIDER	A window unit in which both sash operate and are fully removeable. Not originally designed as a basement unit but the sizes have evolved to meet basement requirements. Lacks sloped sill and must use weep holes for water drainage. A favorite among remodelers since the ceiling can be dropped without adversely affecting the operation of the unit.
LOW E GLASS	A coating applied to glass to increase the insulating value of the overall unit and decreases UV penetration.
INSULATED GLASS	The process of sealing two pieces of glass together and creating a specific airspace to provide insulating value to the glass unit. Overall glass thickness varies. Non-insulated glass has no R-Value.
R-VALUE	Is insulating value, hot or cold transmission, of a unit. It has become the standard for measuring the performance of a window. Please remember, it is not the only tool to measure the performance of a window.
SASH BLOCK FINS	These are the pre-extruded fins along the side of the frame of the basement windows for new construction application in cement block. They can be removed for replacement application.
HEADER	Refers to the top of the window mainframe.
JAMBS	Refers to left and right side of the window mainframe.
SILL	Refers to the bottom of the window mainframe.
SASH	Refers to the operable panel that houses the glass and sits within the mainframe.
ROUGH OPENING	The opening required to install the window unit. Varies upon application.
TIP-TO-TIP	Actual window measurement excluding fins.
MORTAR WASH	The use of mortar mix to slope and fill the void between the sill and the block that is found in the most common cement block applications.
TRUE SLOPED SILL	An angle in the sill of the extrusion that provides natural drainage for the basement unit. Standard in all Duo-Corp. Hoppers.
WEATHERSTRIPPING	Can be found in various forms. Fin-seal, woolpile, and bulb-seal are all examples. This is what seals the sash to the mainframe.
EGRESS	A opening required by code for fireman entry and occupant escape. Varies by area with regards to requirements. ALWAYS CHECK LOCAL CODES.

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