For homes up to 3500 sq. ft. the AirScape 2.5 delivers the airflow required for larger homes while maintaining the low-noise profile that AirScape is famous for. In fact, this is our quietest unit. An exceptionally robust industrial-grade fan, isolated through a noise-deadening ducted design puts the 2.5 in a class all by itself. It's more expensive to build, and requires a little more energy to run than the 1.7, but the performance -- in terms of both airflow and noise -- is truly exceptional. Plus, the 2.5 is low-speed-adjustable, straight-forward to install and comes with a hi-flow grill that minimizes noise and looks as unobtrusive as it sounds.

High power, incredibly low noise

While all AirScape fans deliver high power and low noise, the 2.5 sets a new standard for quiet. The unique ducted design and powerful 18-inch fan work together to raise the bar in terms of performance/noise ratio. The amount of air this unit moves is impressive, and the noise level at which it does this is even more impressive. You really need to feel it and hear it to believe it.

Industrial build quality

Exceptional engineering and build quality is a foundational feature of all AirScape units, the 2.5 is a great example of this, with heavy industrial-grade components that are rare in the consumer market. The shipping weight of this unit is 75 lbs; the fan alone, with its cast-aluminum motorized impeller, weighs nearly 30 lbs. Every aspect of this unit is built to a rigorous specification suitable to demanding industrial applications.

Two-speed operation

On high speed, you get over 2500 CFM to cool your house down fast without sounding like a jet engine. Set to low, the 2.5 runs virtually silent -- an astounding 51 dBA @ 1m -- so all you'll hear is air whooshing quietly through the cube core grill. The unit is controlled via a wall-mounted switch (included) or optional wireless remote.

Adjustable low-speed setting

Also, the low-speed setting is user-adjustable, so you can tweak it according to your tastes and installation requirements to achieve maximum low-speed flow rates while maintaining near-silent noise levels.

Excellent energy efficiency

At full power, the AirScape 2.5 uses just 395 watts of power, a small fraction of the energy used by an A/C compressor. While the ducted design requires more energy than our drop-in models, the 2.5 is still very efficient. If you are comparison shopping, you'll see that the 2.5 uses significantly less power than competitive whole house fans in terms of CFM/Watt. In fact, the AirScape 2.5 qualifies for energy rebates in a number of states and municipalities. Please check with your local utility for more information and check our rebates page to see if your utility company is listed.

Automatic insulating damper

A key drawback with traditional whole house fans was air leakage between the attic and living spaces. This could result in dirty attic air entering your home, and, in cold climates, warm, and moist indoor air entering the attic and causing water damage through condensation. Properly installed, the AirScape 2.5 takes care of this problem with an automatic, industrial-grade damper. When the fan is off, your attic is sealed tight. So attic air NEVER leaks into your living space, and warm air never condenses in your attic.

Premium Cube Core grill

The AirScape 2.5 comes with a premium high-flow grill that minimizes air movement noise through the grill. These high-performance grills look great too, so your system looks as unobtrusive as it sounds.

Easy installation

The AirScape 2.5 mounts between standard joists, either 16-inch or 24-inch centers using pre-drilled tabs. It is specifically designed to fit through its own mounting hole, so no other attic access is required. Equipped with a standard plug and an available remote control, the unit can be installed with plug and play simplicity. See our ducted installation page for complete details.

Maintenance-free operation

The AirScape 2.5 employs an industrial fan unit which is sealed and never requires lubrication. The only other moving parts are the twin heavy-duty door actuators which are tested to 45,000 cycles and are also maintenance-free. All mechanical and electrical parts are accessible and can be serviced or replaced without removing the entire unit.

3-year warranty backed by professional support

Not only are the units guaranteed for 3 years, but they're backed by our professional technical support. If you have a problem with your unit -- or just a question -- you'll get prompt, knowledgeable responses from real engineers. Guaranteed.

Fan	18-in industrial-grade EBM fan
Airflow	2516 CFM (high)
Energy use	395 Watts (high)
Efficiency	7.0 CFM/Watt
Accoustical (hi/low)	51/46 dBA @ 1m
Attic seal	air-tight with industrial-grade damper
Insulation	insulated dampers provide R-10 concerned about R-Values? read more
Control	dual SPST Decora switch; optional wireless remote
Grille	high-flow, aluminum cube-core (white)
Installation	drops in between 16 in or 24 in O/C joists
Rough opening	14.5 in x 22.5 in
Required roof venting	5 sq. ft. net-free [learn more]
Grille size	16 in x 24 in (outer)
Damper box (L x W x H)	20.25 in X 27 in X 14.25 in
Shipping weight	75 lbs
Electrical requirements	120 VAC, 60hz, 3.5 Amps
Warranty	three years