H&C Flex 24" x 16" (Wall Opening Size) White Sidewall/Ceiling Return Air Filter Grille (659 Series)

Features: Effectively conceals filter Use standard 1" thick filters (not included) Removable face for easy installation and cleaning Equipped with adjustable filter retainers Bright white enamel finish Average face velocity = 390 fpm, based on filter capacity rating of 2 cfm per square inch of gross filter area Free area averages 75% of grille core Residential For quick calculation free area (sq. in.) = listed width×height×.75