PME-S series exhaust fan with slim housing. It is constructed of rust resisting powder coated premium cold roller steel with a standard sized 4 inch diameter duct collar. It has polymeric paintable grille secured in place with torsion springs, easily removed if necessary. Enclosed 4-pole electronically balanced permanently spilt capacitor motor (PSC). Life time lubricated ball bearing suitable for continuous operation. Requires no maintenance. Special design heavy duty ABS sirocco blower, dynamically and statically balanced. The exclusive wheel design allows for efficient cooling for the motor, providing long operation life. It allows the end-user to change the fan capacity in the field simply by changing fan blower assembly.