Los Angeles Window and Door Glossary

Windows and patio door (Los Angeles Window and Door Glossary)


Everyone knows what a window or door is. However, when it comes to window and door types, parts, and elements, we may not all be too knowledgeable. Having a basic understanding of window and door terminology will come in handy when it comes to installing new windows for your home, apartment complex, or commercial property in Los Angeles. It will allow you to communicate more effectively and get exactly what you want. Check out our window and door glossary below for important parts and components that will enable you to discuss your window/door project with a window expert easily:



The space between two or more panes of glass in windows and doors.


Airspace Grilles

Aluminum bars that are sealed in the insulating airspace between two panes of glass in windows and doors.


Argon Gas

An inert, nontoxic gas used between window panes for insulation and reducing heat transfer.


Awning Window

A single-sash window that’s hinged at the top and uses a handle crank to wing out the bottom of the windows towards the exterior of the property. 


Bay Window

A continuum of picture windows consisting of two or more windows placed at 30, 45, or 90-degree angles. This allows them to extend outside a property’s exterior.


Bow Window

A window consisting of three or more glass panes extending out from the wall to form a radius.


Brick Mould

A decorative moulding that surrounds the exterior of a window or door frame.


Casement Window

A single-sash window that is hinged on one side and uses a crank to swing open towards the left or right.


Door Rollers

Two sets of wheels with ball bearings that allow sliding patio doors to open and close smoothly with minimal effort.


French Doors

A type of patio door featuring large hinged glass doors that swing open and closed.



Parts of windows and doors, such as locks, hinges, and crank handles. They’re used to operate and secure windows and doors.



The hardware portion of windows and doors that allow the window sash or door panel to open.



The left and right vertical parts that form the frame on a window or door.


Low E

Literally meaning, “low emissivity,” this refers to a window or door’s surface condition that emits low levels of radiant thermal energy (heat).


Muntin Bars

The narrow horizontal/vertical bars that are used as decorative patterns on windows and doors.


Operator Handle

Window hardware used to crank the sash open on an awning or casement or window.


Picture Window

A stationary window is primarily used to capture wide views of the exterior landscape.



The horizontal framework of a window sash or door panel.



A measurement of how heat-resistant a material is. The higher the R-Value, the greater insulating effect it has, the more efficient it is as decreasing heat flow into the property.



The operating or fixed portion of a window, consisting of top and bottom horizontal rails, left or right stiles, and the glass itself.



The framed fiberglass mesh on windows and sliding patio doors that prevent the entry of insects while open.



Horizontal piece forming the bottom of the window/door frame.


Single Hung Window

SA windows with two sashes, where the bottom slides up and down while the top remains stationary.


Sliding Patio Door

A patio door that consists of two large panes of glass. One pane remains stationary while the other glides open.


Solar Heat Gain Coefficient (SHGC)

The measurement of how well a window or door prevents heat from passing through it. The lower a window or door SHGC is, the less heat it will transfer.


Triple Slider

A three-sash window that features a stationary center sash that opens and closes bear sliding sideways.



The measurement of how much energy a material conducts, The lower the U-value, the better the insulation effect.


Weather Stripping

A strip of weather-resistant material used to seal sashes and frame members to reduce water and air infiltration.


Now that you have knowledge of the major window and door types, parts, and elements, it’ll be a lot easier for you to discuss with us about your Los Angeles windows and door needs. Give Wintorium a call at (323) 307-7376, or click here to schedule an appointment today!