Belt drive whole house fan with white powder-coat finish shutter. 2-speed, thermally protected 1/3 HP (horsepower) PSC (Permanent Split Capacitor) motor. Precision balanced aluminum fan blade assembly. 4 fan blades for greater air movement. Includes 2-speed switch and wall plate. Joist-in or joist-out installation. Ceiling mount application only. Dual ball-bearing technology. Tough steel motor struts. Steel venturi for enhanced durability. 24″ whole house fan is appropriate for homes with up to 1800 sq ft (square foot) attics. Requires a minimum of 8 to 10 sq ft of net free air exhaust vent area. 30″ whole house fan is appropriate for homes with 2000 to 3000 sq. ft. attics. Requires a minimum of 10 to 12 sq ft of net free air exhaust vent area. 36″ whole house fan is appropriate for homes with attics over 3200 sq. ft. Requires a minimum of 12 to 14 sq ft of net free air exhaust vent area. Veins run lengthwise on 24″ and 30″ – crosswise on 36″ whole house fans. Center vein is stationary to allow no-cut joint installation. 10 year limited warranty. No. CX24BD2SPD: Size: 24″, Drive Type: Belt Drive, For Use With: Up to 1800 sq ft, Rough Opening: 25-1/2″ x 27-3/4″, Shutter Inside Dimensions: 23-3/4″ x 25-1/2″, Shutter Outside Dimensions: 28″ x 29-3/4″, Finished Fan Frame Dimension: 28-3/8″ x 28-3/8″, Rate: High 4500/Low 3100, Net Free Area: 8 to 10 sq ft, Pkg Qty: 1, Package Type: Box No. CX30BD2SPD: Size: 30″, Drive Type: Belt Drive, For Use With: 2000 to 3000 sq ft, Rough Opening: 29-1/4″ x 32″, Shutter Inside Dimensions: 27-1/4″ x 29-3/4″, Shutter Outside Dimensions: 31-1/2″ x 34″, Finished Fan Frame Dimension: 35″ x 35″, Rate: High 7800/Low 5400, Net Free Area: 10 to 12 sq ft, Pkg Qty: 1, Package Type: Box No. CX36BD2SPD: Size: 36″, Drive Type: Belt Drive, For Use With: Over 3200 sq ft, Rough Opening: 37-1/4″ x 33-1/2″, Shutter Inside Dimensions: 35″ x 31-1/4″, Shutter Outside Dimensions: 39-1/4″ x 35-3/4″, Finished Fan Frame Dimension: 42-1/8″ x 42-1/8″, Rate: High 9700/Low 6800, Net Free Area: 12to 14 sq ft, Pkg Qty: 1, Package Type: Box
