Whole House Fan : Tamarack HV1600 2 Speed Specification:

House Size: HV1600 Typical  24" Fan Typical 30" Fan
Air Flow: 1000 cfm/low 3000 cfm 6000 cfm
  1600 cfm/high    
1500 Square Ft.: 7.5 minutes/high 4 minutes 2 minutes
2000 Square Ft.: 10 minutes/high 5.33 minutes 2.67 minutes
2500 Square Ft.: 12.5 minutes/high 6.67 minutes 3.33 minutes

Specifications:

Power Requirements: 115V AC 60 HZ
Fans Running: 276 Watts
Lift Motors Running: 6 Watts
Open/Close Time: 30 Seconds
Air Flow @ .1 SP: 1000 cfm low/1600 cfm high.
Sound Level: TBA
R Value Closed Panel: R-22
Rough Opening: 14.5" x 22.5"
Height With Door Open: 11" @ R-22, 12" @ R-38
Interior Grille: Return Air white
Approx. Amps: 1.02 Low/2.4 High
Weight: 27 lbs (35 lbs shipped)
Net Free Area Required: 3 Square Feet

The HV1600 2 Speed Whole House Fan Is Available Now At
R.E. Williams Contractor Inc