User Manual

Roof Curb Attachm ent

Please refer to Fig. 2. To attach an assembled fan onto a ro of curb, do the following –

1. Remove the weather cover; it is attached to the motor plate with self-tapping screws.

2. Unbolt and remove the motor plate, complete with the motor/flange-bearing and wheel assembly.

3. If a shutter or damper is to be installed, then insert inside the roof curb, or attach to the underside of the fan base,

depending on t he type used.

4. Position the fan base section on top of the roof curb. Rotate the base so that the roof drain is on the outside of the curb

for water run-off.

5. Fasten the fan base section to the roof curb with counter sunk, self-tapping screws at center distances as shown on the

submittal ‘Technical Data’ sheets. Lag screws may also be used, as long as the bolt head is flush with the top of the

curb.

6. Reassembly of the fan parts are the reversal of disassembly.

Wall Attachment

The fan is attached in a similar way to roof mounting, except that the curb is replaced by spacer blocks or frame, (not supplied).

See Fig. 3 for details.

Fig. 3 – Wall Mounted

Wheel-to-Inlet Clearance/Overlap

The correct wheel-to-inlet clearance/overlap is critical to

proper fan performance. This clearance should be verified

before initial start-up since rough h andling durin g shipment

could cause a shift in fan components. Refer to Fig. 4 -

Wheel/Inlet clearance for details – the gap should be 1/8”

on all sizes of RKW fans.

Fig. 4 – Wheel/Inlet Clearance