When space restrictions prevent the use of in-line duct fans, this product can be as little as 4 inches, providing room to connect appropriate ductwork.

These fans are suitable for residential, commercial, and light industrial ventilation applications. The quiet and efficient backward–curved motorized impeller is capable of developing significant pressure, and the in-line configuration simplifies installation, saving time and money.

The RKB is a compact, high capacity, rectangular centrifugal fan that can be installed in any position. RKBs are UL705 approved. It connects to rectangular ducts and features backward curved impellers. 

The LPKB is a low profile inline duct fan designed with a backward curved impeller for high efficiency and cfm’s. All LPKBs are UL705 approved and HVI certified. It connects to circular ducts. 

The CK is an inline duct fan that combines the benefits of a radial fan with high pressure and low noise levels along with ease of installation. It installs in any position and is compatible with speed controllers. 

When space restrictions prevent the use of in-line duct fans, EXT External Mount Duct Fans can be used, said the company. EXT fans provide a simple through-the-wall solution, and can be sidewall mounted on the exterior of a building to allow for easy access to the fan. Installation space can be as little as 4 inches.