Dayton square centrifugal in-line blowers mount inside the ducts to ventilate, intake, exhaust and makeup air in industrial and commercial applications. These blowers have galvanised steel housing and aluminium, backward inclined centrifugal wheels for corrosion resistance, durability and easy manouverability, respectively. They feature belt-drive motors for greater flexibility in terms of rpm speeds, as the motor is not directly in contact with the fan's moving parts. These blowers come with collars for quick installations in ducts and panels on each side of the blowers for fast access to internal components. Choose from a wide range of these inline blowers, available in wheel diameters ranging from 13-1/2 to 42-1/2 inches.