3 Hour Out Of Air Fire Door Grille 2663-48X20 T-Bar inner dimension and outside dimension

inner dimension and outside dimension available * Available in continuous lengths with butt joints * Tamper proof screws * Standard Color

" Spiral pipe diameter must be 4” larger than width of grille

Available 4" thru 40" round

smooth style * 360 air diffusion * Excellent for variable air volume applications * Hinged-down core for easy access * No Labor Collar * Seismic support hangers * Available sizes: 6"-10"

3 Hour Out Of Air Fire Door Grille 2663-48X20 T-Bar inner dimension and outside dimensionh3. Standard Features * 2661 Square or rectangular fire door for vertical mount only. Maximum dimension 60x60. For damper free area chart A click here * 2663 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 60w x 52h. For damper free area chart B click here * 2665 Round fire door for vertical mount only. Available 4" thru 52" round. * 3 hour rated * UL and California State Fire Marshall approved * 4 1 4"