4" 3 Hour Vertical Mount Fire Door 2661-24X24 Smoke-Fire Damper Retainer cables are provided on

Retainer cables are provided on sizes 12" and larger to allow the inner cones to hang securely while adjusting the diffuser

904 Series Performance Data

Standard Features * For evaporative cooling or high velocity exhaust applications with divided 2-way multi-louver and combination shut-off * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White

SD52 - Transition Box Spiral Pipe Grille (Single Deflection)

4" 3 Hour Vertical Mount Fire Door 2661-24X24 Smoke-Fire Damper Retainer cables are provided onh3. 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"