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 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.