Back to Window Glossary
An extrusion that attaches to the window frame and used to secure the unit to the rough opening. (See Installation Fin)
Definition National Fenestration Rating Counsil (NFRC)
See What Installations We've Done Near you
View Our Recent Work
Get a Free Estimate for Your Home Improvements
Schedule Your Free Estimate
See More Reviews
Michael Just said...
"Always a pleasure to deal with your team. very professional and no gimmicks"