Model/
Features |  4.4e WHF |  4.5 WHF |  2.5e WHF |  2.5 WHF |  1.7 WHF |  1.0 WHF |  Kohilo-2.8 |
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| CFM (high) | 4410 | 4673 | 2536 | 2516 | 1712 | 1047 | 2850 |
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| CFM (low) | 2132 | 3100 | 1530 | 2110 | 1000 | 600 | 2501 |
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| Fans | 1 24 inch Aluminum Blade with Powder Coated Housing | 1 20 inch Motorized Plastic Impeller inside of enamel coated steel housing | 1 22 inch Aluminum Fan Blade with Powder Coated Housing | 1 22 inch Aluminum Fan Blade with Powder Coated Housing | 4 10 inch Precision Fans | 2 10 inch Precision Fans | 1 22 inch Aluminum Blade with powder coated housing |
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| Watts (high) | 699 | 852 | 197 | 292 | 157 | 78 | 297 |
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| Watts (low) | 102 | 705 | 44 | 288 | 78 | 39 | 263 |
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| Efficiency (CFM/Watt) | 6.3 | 5.5 | 12.9 | 8.4 | 10.9 | 13.4 | 9.6 |
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| Noise (dBA @1 meter) | 50 | 55 | 50 | 51 | 55 | 53 | 47.5 |
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| Noise (low spd dBA) | 32.5 | 46 | 37 | 48 | 44 | 43 | 44.5 |
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| Attic Seal | Airtight Motorized and Insulated Metal Door with Gasket | Airtight Motorized and Insulated Metal Door with Gasket | Airtight Motorized and Insulated Metal Door with Gasket | Airtight Motorized and Insulated Metal Door with Gasket | Airtight Motorized and Insulated Metal Door with Gasket | Airtight Motorized and Insulated Metal Door with Gasket | Steel Backdraft Damper |
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| Insulation | 2 inch PolyISO/Fiberglass R-10 | 2 inch PolyISO/Fiberglass R-10 | 2 inch PolyISO/Fiberglass R-10 | 2 inch PolyISO/Fiberglass R-10 | 2 inch Fiberglass R-7 | 2 inch PolyISO R-14 | none |
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| Controls | Dual Switches, Decora Style. Optional Wireless Remotes | Dual Switches, Decora Style. Optional Wireless Remotes | Dual Switches, Decora Style. Optional Wireless Remotes | Dual Switches, Decora Style. Optional Wireless Remotes | Dual Switches, Decora Style. Optional Wireless Remotes | Dual Switches, Decora Style. Optional Wireless Remotes | Dual Switches, Decora Style |
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| Grille | High Flow Cube Core White Aluminum | High Flow Cube Core White Aluminum | High Flow Cube Core White Aluminum | High Flow Cube Core White Aluminum | High Flow Cube Core White Aluminum | High Flow Cube Core White Aluminum | High Flow Cube Core White Aluminum |
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| Grille Size | 24 inch x 28 inch | 24 inch x 28 inch | 16 inch x 24 inch | 16 inch x 24 inch | 16 inch x 24 inch | 16 inch x 24 inch | 24 inch x 28 inch |
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| Installation | Drops onto 16 or 24 inch O.C. joists | Drops onto 16 or 24 inch O.C. joists | Drops onto 16 or 24 inch O.C. joists | Drops onto 16 or 24 inch O.C. joists | Drops onto 16 or 24 inch O.C. joists | Drops onto 16 or 24 inch O.C. joists | Drops onto 16 or 24 inch O.C. joists |
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| Rough Opening | 22.5 inch x 26.5 inch | 22.5 inch x 26.5 inch | 14.5 inch x 22.5 inch | 14.5 inch x 22.5 inch | 14.5 inch x 22.5 inch | 14.5 inch x 22.5 inch | 22.5 inch x 26.5 inch |
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| Attic Venting (NFA) | 9.0 | 9.0 | 5.0 | 5.0 | 4.0 | 2.0 | 5.0 |
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| Unit Size (l x w x h) | 25.75 inch x 29 inch x 16.25 inch | 25.75 inch x 29 inch x 16.25 inch | 20.25 inch x 27 inch x 14.25 inch | 20.25 inch x 27 inch x 14.25 inch | 22 inch x 22 inch x 13 inch | 17.5 inch x 27.5 inch x 8 inch | 20.25 inch x 27 inch x 14.25 inch |
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| Weight | 90 lbs | 80 lbs | 60 lbs | 60 lbs | 36 lbs | 26 lbs | 50 lbs |
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| Shipping Weight | 112 lbs | 102 lbs | 75 lbs | 75 lbs | 52 lbs | 38 lbs | 70 lbs |
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| Electrical | 120VAC, 60hz, 8.0 amps | 120VAC, 60hz, 9.0 amps | 120VAC, 60hz, 3.0 amps | 120VAC, 60hz, 3.0 amps | 120VAC, 60hz, 1.5 amps | 120VAC, 60hz, 0.75 amps | 120VAC, 60hz, 3.0 amps |
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| Warranty | 3 Years | 3 Years | 3 Years | 3 Years | 3 Years | 3 Years | 3 Years |
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