1. Frame opening for fan should be square and 1/2″ larger than fan size. (Example: For a 10″ fan, the rough opening should be 10 1/2″ x 10 1/2″.)
2. Frame opening for intake shutters should be square and 1/2″ larger than the shutter size. (Example: For 10″ shutter, the rough opening should be 10½” x 10½”.) Optional shutter locations shown with asterisk (*).
3. If trim and finish work is required around fan or shutter, then the frame opening is 3½” larger than fan or shutter size.

Fan System Options

Fan Speed Control:

Provides variation of fan speed to match the season. High speed in summer, slower in spring and fall, and very slow speed in winter to avoid sudden chilling of the greenhouse.

Shutter Motor:

Provides opening and closing of the shutter(s) and relieves starting load on fan motor. Use only with heavy- duty, aluminum frame shutters.