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Glossary
Knowing the right names for parts of your window can help you avoid confusion. Read through these important window parts terms and definitions for Durabuilt windows and you’ll be set.
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Lock-Out
Service provided to home builders where a Service Technician installed all the screens and inspects all windows and doors for proper operation prior to homeowner occupancy.
Low-E Glass
Term used for glass which has low emissivity, transparent coating, that reflect varying amounts of heat providing reduced energy costs and improved comfort.
Meet Rail
The intersection of interlock mullion and the sliding sash or panel.
Mulled Unit
Individual window boxes joined, or mulled together, to make a combination window.
Mullion
Vertical or horizontal element that forms a division between the units of a window or door.
Mullion Cover
Vinyl or aluminum strip applied to cover the joint between mulled windows on the inside and outside.
Multi-Point Lock
Single lever operation that locks the window sash or door in multiple locations for a tighter seal and security.
NAFS
Abbreviation for National Association of Fenestration Standards / Specifications that regulates window and door performance rating.
Nail Fin Monoframe
Unique new build window solution by Durabuilt that features a one piece, monolithic frame for improved air and water tightness.
Nailing Fin
Narrow attachment strip on the window perimeter that typically used to secure the window to the rough opening. On a window it is usually extruded with the frame.
OSM
Outside measurement, or outer dimension, of a window or door frame.
Obscure Glass
Patterned glass that provides additional privacy. Also known as privacy glass.
Omega
Versatile vinyl window series by Durabuilt.
Outswing
Door designation meaning the door slab swings outward, away from the home.
PVC
Abbreviation for polyvinylchloride; the type of plastic used in vinyl windows extrusions.
Peakhead Window
Picture window shape with peaked appearance.
Picture Window
Non-venting, low profile window type that provides maximum light and view.
Privacy Rating
Scale from 1 to 9 (1 being the least privacy) used to rate the privacy of obscured glass.
Pulse®
A Therma-Tru® modern looking door offering.
R-Value
Term used to indicate an object’s ability to resist heat loss. The higher the R-value, the better an object’s ability to resist heat loss. R-values are determined by inverting the U-value (R=1/U).
ROTO®
The name of the company that manufacturers and supplier window and door hardware to Durabuilt.
Rakehead Window
Picture window shape with an angled appearance to follow a roof line.
Reno Brickmould
Vinyl exterior trim available in 2” and 1 ½” width applied to a window and used for full frame window replacement applications. A snap-on cover can be removed to install the window.
Rotogear Hardware
Operating hardware for casement and awning windows that uses a rotogear mechanism to open the sash for venting.
Rough Opening
Framed wall opening size to accept a window or door.
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