GLOSSARY-I

Insect screen

A close-mesh woven screening material of metal, plastic, or fiberglass for a window or door screen, to block the entry of insects but permit light, air, and vision through the screen.

Insulating Glass Unit (IGU)

Typical configuration of glass in a window, door or skylight frame, consisting of two (or more) pieces of glass held apart with a spacer and hermetically sealed to form a single glazed unit with one or more air spaces in between. Also called double glazing or dual pane.

Impact resistant glass

Laminated glass is a type of safety glass that holds together when shattered. In the event of breaking, it is held in place by an interlayer, typically of Polyvinyl Butyral (PVB), between its two or more layers of glass. The interlayer keeps the layers of glass bonded even when broken, and its high strength prevents the glass from breaking up into large sharp pieces. It's easily recognized by its characteristic "spider web" cracking pattern which results when an impact is powerful enough to crack the glass. Laminated glass is normally used when there is a possibility of human impact or where the glass could fall if shattered. Skylight glazing and automobile windshields typically use laminated glass. In geographical areas requiring hurricane-resistant construction, laminated glass is often used in exterior storefronts, curtain-walls, doors and windows. The PVB interlayer also gives the glass a much higher sound insulation rating, due to the damping effect, and also blocks 99% of transmitted UV light.

Integral fin

Nailing fin protruding from the extrusion that is part of the extrusion (as opposed to an add-on fin). Is centered on a window or a door (front to back) and extends 1-1/8" beyond the unit measurement.

Interior glazes

Glazing installed from inside of building.