Master Flow
Master Flow WHFS24M Direct Drive Whole House Fan
$379.99
Best Whole House Fans · head-to-head
Master Flow WHFS24M Direct Drive Whole House Fan vs Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan
A sourced, side-by-side comparison. Master Flow WHFS24M Direct Drive Whole House Fan is cheaper at $379.99. Every spec and price links to its source.
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Cool Attic
Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Master Flow WHFS24M Direct Drive Whole House Fan | Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan |
|---|---|---|
| US price | $379.99 | — |
| Brand | Master Flow | Cool Attic |
| Released | — | — |
| Airflow (CFM) | 4,500 CFM | 4,600 / 3,200 CFM (high/low) |
| Coverage (sq ft) | up to 2,000 sq ft | 1,200-1,800 sq ft |
| Speed settings | — | 2 |
| Drive type | direct_drive | direct_drive |
| Insulated damper | No | No |
| Remote or app control | No | No |
| Sound level note | — | — |
| Motor warranty years | — | 10 |
Sources — Master Flow WHFS24M Direct Drive Whole House Fan: thelumberyard.com (verified 2026-08-16). Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan: amazon.com (verified 2026-08-16).
What's the difference between the Master Flow WHFS24M Direct Drive Whole House Fan and Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan?
Where the two actually differ on the specs we track (2 of 8). Matching specs are omitted.
- Airflow (CFM): Master Flow WHFS24M Direct Drive Whole House Fan 4,500 CFM vs Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan 4,600 / 3,200 CFM (high/low)
- Coverage (sq ft): Master Flow WHFS24M Direct Drive Whole House Fan up to 2,000 sq ft vs Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan 1,200-1,800 sq ft