Aerovent IM-115 User Manual

Tubeaxial fans, Im-115, Installations

Direct-drive and belt-driven tubeaxial fans, or duct

fans, as they are also called, are built to be installed

in the system so as to become a part of the duct.

The fan may be located at the entrance, in the

middle of, or at the discharge end of the duct.

The belt-driven fan design places the motor out-

side of the airstream. The belt drive and bearings are

enclosed in a tube and cover situated on the suc-

tion side of the impeller. For normal air handling and

for high temperature operation, the bearing cover is

open at the impeller end. This design induces airflow

through the belt tube and bearing enclosure, creat-

ing an air insulation barrier which constantly purges

contaminants and, in the case of high temperature

applications, provides drive and bearing cooling. In

situations where the air is wet and very contaminated

with corrosive chemicals, the fan may be built with

the bearing housing completely enclosed and with a

seal around the impeller shaft.

Same Size Duct

Normal fan installation. Rating tables are based on

this arrangement. Variations in installations as indi-

cated below will provide more economical fan perfor-

mance but may require higher installation cost.

Tapered Discharge

Allows regain of a portion of the velocity pressure

to static pressure. The fan can then be selected at

a lower pressure for more economical operation. For

specific design information, consult your Aerovent

representative.

Converging Inlet & Discharge

Provides lower duct velocities and less friction to

airflow. This allows choosing a fan at lower pressure

for more economical operation.

Tubeaxial Fans

Removable

Bearing

Housing

Belt

Housing

Bearing

Base

Access

Door

AXIAL FLOW FAN

Installations

General Installation, Operation and Maintenance Instructions For Aerovent Products

IM-115

June 1997