12x12 inch as measured by hole, see diagram above for additional measurements.
Available in one way deflection, two way deflection , three way deflection , or four way delflection
1/2inch fin spacing set at 40 degrees
Multi-shutter blade
1 5/8 inch depth when fully opened
Used for ceiling or sidewall installations
Interlocking valve louvers for positive shut-off
Ideal for shallow duct installaions
White powder coating finish