Attributes

Key Value
Fits Fan Dia.18 in
Fits Fan Diameter18 in
Flange Width1 1/2 in
For Nominal Duct Diamet.Not Applicable
Frame Depth3 in
Frame Opening Height18 1/2 in
Frame Opening Width18 1/2 in
ItemWall Backdraft Damper
Mounting Hole Diameter1/4 in
Mounting Hole SizePrepunched
Open Depth6 1/4 in
Overall Diameter21 in
Overall Height21 in
Overall Length6 1/2 in
Overall Width21 in
Rough Opening Diameter18 1/2 in
Rough Opening Length18 1/2 in
Rough Opening Width18.5 in
Shutter Construction Ma.Extruded Aluminum Frame.
Shutter Free Area2.043 sq ft
Shutter Mounting Locati.Wall
Shutter Mounting Positi.Vertical
Shutter Opening Required18-1/2 in x 18-1/2 in
Shutter Overall Size21 in x 21 in
© 2025 · Data Alchemy · Version 60 · ts:1760052239
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