WHOLE HOUSE FAN SHUTTER

• Injection molded frame with smooth aluminum louvers that automatically open when fan turns on, and close when fan turns off to keep out air, insects, and dust.
• Balanced shutters for complete automatic service-free operation.
• Installs centered on joist with 18" or 24" centers with 2 cut openings, 1 on each side of center joist per shutter model.
• Opening Size Required: 33-3/4" x 28-1/4"
• 35-3/4" L x 30-1/4" W x 3/4" D outside dimensions - fits where sheetrock is cut out, louvers open into attic space approx 3-1/2"
• Fits Whole House Fans: WHFS30M and 30BWHFS
• White enamel finish, interior use