4" 3 Hour Vertical Mount Fire Door 2661-40X52 past 12 months Dampers above 80 square inches

Dampers above 80 square inches free area will be provided with blade insulation

Adjustable modular cores with fixed curved blades

CB Series 6X6 REVIT Files

53% free area * 1306: 3/4" lattice opening

RS34 Series Engineering/Performance Data

4" 3 Hour Vertical Mount Fire Door 2661-40X52 past 12 months Dampers above 80 square inchesh3. 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"