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Tool Operated Opposed Blade Damper
w/ Lever Operated Opposed Blade Damper
HVL Series Engineering/Performance Data
Options (must specify when ordering)
Spiral pipe diameter must be 4” larger than Height of the duct opening
3 Hour Out Of Air Fire Door Grille 2663-22X22 Specialty Products Tool Operated Opposed Blade Damperh3. 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"
