Triangle Engineering Optional Gravity Damper (Bolts to Triangle Engineering brand Exhaust Fans)

Triangle brand Optional Back Draft Damper for Industrial Exhuast Fans (Bolt On)

IWS SERIES AUTOMATIC SHUTTERS

◆ May be used with belt or direct drive fans
◆ Opens automatically when fan is turned on and closes when air flow stops
◆ Frames are heavy-gauge galvanized steel with powder coat finish
◆ Extruded aluminum shutter blades attach with bronze bushings and steel fasteners.

This eliminates rust and corrosion, permitting continuous, smooth operation without lubrication
◆ Available for all PFG fans, Standard on SLW series fans

INDUSTRIAL WALL SHUTTERS
Model No.	For Fan Size	Outside Dimension	Inside Dimension	Depth	Ship Wt.
IWS 24	24"	33⅜ X 33⅜	31" X 31"	4"	26
IWS 30	30"	36⅜ X 36⅜	34" X 34"	4"	29
IWS 33	33"	39⅜ X 39⅜	37" X 37"	4"	33
IWS 36	36"	42⅜ X 42⅜	40" X 40"	4"	39
IWS 39	42"	45⅜ X 45⅜	43" X 43"	4"	42
IWS 42	42"	48⅜ X 48⅜	46" X 46"	4"	44
IWS 45	48"	51⅜ X 51⅜	49" X 49"	4"	49
IWS 48	48"	54⅜ X 54⅜	52" X 52"	4"	55
DOUBLE PANEL WALL SHUTTERS
IWS 54	54"	63⅜ X 63⅜	61" X 61"	4.5"	76
IWS 60	60"	69⅜ X 69⅜	67" X 67"	4.5"	88

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