Highlights:
- Replacements for whole house fans.
- 24″ fits WHFS24M
- 30″ fits WHFS30M & 30BWHFS
- 36″ fits 36BWHFS & P36WHFS
- 35-3/4″L x 33-1/4″W OD
- 33-3/4″L x 28-1/4″ W opening?
- Automatic
- No-cut joist
- White Installs centered on joist with 18″ or 24″ centers with 2 cut openings
- Balanced shutters for complete automatic service-free operation.
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