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Window Lingo Window Types
  Window Lingo

Air Infiltration
 The amount of air leakage out of a window through cracks in framing or past weather stripping measured in cubic feet minute per square foot (cfm/ft²).

Argon Gas
This is an inert gas that is inserted into the space between the glass. The gas is less dense than air and therefore transmits heat and sound at a slower rate. This adds to the sound proofing of the window and adds to the insulation value. Over time this gas will dissipate thereby losing it's value.

Mechanical device used on double-hung windows to counterbalance the weight of each sash during opening and closing. There are four balances in a double-hung window.

Bi-Glass System®
A window renovation system in which the single pane glass is replaced with insulated glass while retaining the original sash and a vinyl jambliner system replaces the old weight and pulley or friction balance system.

Double Glazing
Two panes (or lites) of glass separated by an insulating space in a window. They may be individual panels or a sealed unit. The dry, airtight space between the panes minimizes condensation and provides excellent insulation.

 Usually refers to the glass system used by a window, including the glass, glass coating, insulating spacer, and glass sealants.

Hidden Balances
 These are balances that are cut into the side of the sash and attach to the jamb so that they remain hidden from view at all times.

This refers to the air that leaks around the sash and works it's way into the weight pocket area in the wall. This infiltration makes up 2/3's of the heat loss in a standard single pane window.

Using Blown Cellulose which is a naturally recycled product will help stop air infiltrations in your windows.

Consists of a vinyl unit that has spring balances installed into it to balance the window sash in its operation. This replaces the old weight and pulley system . They have a foam backing to prevent infiltration and weather-stripping to prevent air leakage at the meeting rails.

Layers of Glass and Air Spaces

This has very little insulating value with (approximately r-1). It provides only a thin barrier to the outside and can account for considerable heat loss and gain.

To improve a window's energy efficiency the number of glass panes in the unit is doubled, because multiple layers of glass increase the window's ability to resist heat flow. 


Low E Glass
A major cause of winter cold spots and drafts is window glass.

 A muntin is the grid work that separates the panes of glass in a sash.

This is the wooden operable part of the window, that holds the glass in place.

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