Window Terminology

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Window Terminology

Our window terminology page can hopefully provide some answers to the terms and meanings behind many of the lexicon of replacement windows. We will be adding words and terms over time, but if you would like to see something add, please drop us a line. dane@replacementwindowsreviews.co

Dane - Site Editor - Page Last Updated: January 8, 2024

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Window Frame Terminology

Explore window frame terminology as it relates to replacement windows and doors. Also, we will be adding more terms in the coming months.

Cam Lock

Cam locks lock the window in place - pretty straightforward. Specifically, the came lock(s) are located along to the top of the sash on a single hung windows. Homeowners rotate the handle to either lock or unlock the window. Fixed frame window do not have cam locks.

Main Frame

The term refers to the overall frame of the window. For operable windows, the sash(es) and IGU (insulated glass unit) are located inside the mainframe. However, fixed frame or inoperable windows would simply have the IGU inside of the mainframe.

Window Sill

A window sill is the bottom edge of the mainframe. The best sill is a true sloped sill that sloughs off water and thereby not allowing water to sit and cause and damage. Some manufacturers use weep holes to save on money.

Window Construction Terms

Explore construction terminology as it realtes to replacement windows and doors. Also, we will be adding more terms in the coming months.

Clear Glass

Clear glass is the least expensive and most simple home window glass available. It has no layers or coating applied to the surface and is therefore does not filter out any of the heat from the UV rays.

Low-e Glass

Low-e stands for low emissivity, which is a measure for how much heat is tranferred through the surface of the glass. Additionally, Low-e glass has one or more thin layers of coating (made up of metallic particles) that are applied to the surface that act similarly to a sieve. These layers help to filter out heat (long wavelengths), while allowing light (short wavelengths) to filter through.

Window Terminology : Components

Explore components terminology as it realtes to replacement windows and doors. Also, we will be adding more terms in the coming months.

Brick Molding

Certain manufacturers create windows with a brick molding surround (a clean, stylish, and traditional look) on the window for a clean look when the installer puts in the window. However, an installer might also add a wood trim to create the exterior look of molding.

Energy Efficient Terms

Explore energy efficient terms as it realtes to replacement windows and doors. Also, we will be adding more terms in the coming months. Lastly, for performance data on different window brands, visit the National Fenestration Rating Council website.

Air Infiltration

AI as it is known is a measure of how much air leaks through the window unit. For me, this is the most important factor when it comes to finding an energy efficient replacement window. Air infiltration ratings range between 0.01 and 1.0.

Related Topic: Retrofit Windows Reviews

* Disadvantages Of Low-e Glass