1. Install the spring hanger as shown in Fig. 4.
2. Only after the fan is in it’s final operating weight should the spring be adjusted. To adjust the spring, turn the nut directly
above the spring cup clockwise. This will compress the spring.
3. When supporting the fan, not more than (3) complete turns should be made on the adjusting nut for each hanger at one
time. Begin at one support point and progress around the fan compressing each spring in turn. This will tend to
compress all springs uniformly and eliminate overloading of individual hangers.
4. Should any point be overloaded, turn the nut counterclockwise. This will unload the spring.
5. Check the level of the fan. The fan may now be leveled by making small adjustments of the individual isolators.
6. After the fan is level, visually check each isolator to make sure the spring coils are not closed solid.
Duct Installation
Efficient fan performance relies on the proper installation of inlet ducts (where factory inlet plenums are not provided). For duct
inlets, allow at least 3 fan wheel diameters between duct turns or elbows and the fan inlet. See Fig. 5 below.
Fig. 5 – Inlet Duct Turns
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 handling during shipment could cause a shift in fan components. Refer to Fig. 6 - Wheel/Inlet Overlap for
details.
Fig. 6 – Wheel/Inlet Clearance/Overlap
4
DHK
AXCL
DIM A (in)
1225
1225
9/16”
1500
1500
5/8”
1825
1825
3/4"
2225
2225
15/16”
2450
2450
1-1/32”
2700
2700
1-1/16”
3000
3000
1-5/16”
3300
3300
1-11/32”
3650
3650
1-1/2”
4025
4025
1-5/8”
4450
4450
1-13/16”
4900
4900
2”
5425
2-1/8”
600
2-3/8”
6600
2-1/2”
7300
2-3/4”
PVK
DIM A (in)
500
1”
670
1-1/4”
CNW
DIM B(in)
160-200
1/8”
250-400
3/16”
PRVS
DIM B (in)
63-250
1/8”
