Active Air Blowers 

More products from:   Hydrofarm

These quiet UL-listed industrial-quality blowers mount easily into the wall and are pre-wired with an 8 ft. power cord. ActiveAir in-line duct fans are maintenance-free and carry a 1-year warranty. 

Air exchange is necessary to help fight CO2 depletion and to cool your grow room down for best plant growth. There's no more efficient way of exchanging air than with an exhaust blower. ActiveAir fans offer a variety of sizes to best meet your needs.

To determine the approximate size blower you need, divide the cubic footage of the grow room by 5. This gives the CFM (Cubic Feet per Minute) of air movement required. This formula assumes that the blower must be large enough to replace all the air in the room in 5 minutes.

It's better to oversize the ActiveAir blower than using one that is too weak to get the job done.

Specifications:

95 CFM ActiveAir Blower System
4" round intake flange
Exchanges air in a 200 cu. ft. room in 2 minutes
Motor Hp: 1/80 th
Amperage Draw: 0.5

180 CFM ActiveAir Blower System
4" round intake flange
Exchanges air in a 800 cu. ft. room in 4.5 minutes
Motor Hp: 1/80 th
Amperage Draw: 0.5

265 CFM ActiveAir Blower System
4" round intake flange
Exchanges air in a 1200 cu. ft. room in 5 minutes
Motor Hp: 1/33 th
Amperage Draw: 1.1

465 CFM ActiveAir Blower System
4" round intake flange
Exchanges air in a 2200 cu. ft. room in 5 minutes
Motor Hp: 1/40 th
Amperage Draw: 2.2

Optional outflow flanges convert the square exhaust opening (outflow) into a 4" round opening for connections to 4" exhaust ducting.

More info from the manufacturer (PDF format)