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Opposed Blade Damper standard on 4" widths
Standard Features * Extruded aluminum (
Individually welded 14 guage diffusion bars
Concealed mounting holes with mounting screws
Extruded aluminum fixed bar blades at 45°
3 Hour Out Of Air Fire Door Grille 2563-36X36 Specialty Products Opposed Blade Damper standard onh3. Standard Features * 2561 Square or rectangular fire door for vertical mount only. Maximum dimension 48w, 49h. For damper free area chart A click here * 2563 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 48w, 41h. For damper free area chart B click here * 2565 Round fire door for vertical mount only. Available 4" thru 40" round. * UL and California State Fire Marshall approved * 2" thinline frame *
