Centrifugal Blowers are available either in Single Inlet Single Width (SISW) or Double Inlet Single Width (DISW) or Double Inlet Double Width (DIDW) types. The Impeller is of backward inclined design, statistically and dynamically balanced and mounted on the Shaft Drive arrangement could be direct or belt. Backward bladed fans are designed for air systems with dust loads. This range of BI fans is for air systems where the dust load is not too high and a high efficiency is required.
NIS-CO FANS AND BLOWERS

 The majority of blower failures are caused by improper installation or operation. Regenerative blowers have close internal clearances between the impeller and housing. It is important to prevent foreign material from entering that space. Ingested debris wedging between the impeller and housing can cause the blower to lock up and lead to a catastrophic failure. A blower should always be equipped with an intake filter. A 10-micron size is usually adequate. Filters must be kept clean. A blocked filter will starve flow.