# Master Flow WHFS24M Direct Drive Whole House Fan vs Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan: specs and price compared

A sourced, side-by-side comparison of the Master Flow WHFS24M Direct Drive Whole House Fan (Master Flow) and Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan (Cool Attic) among whole house fans.

## Side by side

| Spec | Master Flow WHFS24M Direct Drive Whole House Fan | Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan |
| --- | --- | --- |
| US price | $379.99 | not published |
| Brand | Master Flow | Cool Attic |
| 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 |

## Key differences

- 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

## Sources

- Master Flow WHFS24M Direct Drive Whole House Fan: https://www.thelumberyard.com/FAN-WHOLE-HOUSE-24IN-4500CFM-p/6928790.htm (thelumberyard.com, verified 2026-08-16)
- Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan: https://www.amazon.com/Cool-Attic-CX24DDWT-2-Speed-Shutter/dp/B001AH5BAQ (amazon.com, verified 2026-08-16)

Canonical: https://frontdeskreview.com/gear/whole-house-fans/master-flow-whfs24m-vs-cool-attic-cx24ddwt/
Cite: Per The Front Desk Review, Master Flow WHFS24M Direct Drive Whole House Fan ($379.99) vs Cool Attic CX24DDWT Direct Drive 2-Speed Whole House Fan (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/whole-house-fans/master-flow-whfs24m-vs-cool-attic-cx24ddwt/
License: CC BY 4.0.