Standard overhung SOH (impellers mounted on extended motor shaft)
Four-bearing overhung 4BOH (impellers mounted on shaft coupled to motor shaft)
Four-bearing outboard 4BOB (impellers mounted on shaft supported at both ends by self-aligning ball bearings, coupled to motor shaft).
SOH and 4BOH machined are noted for the trademarked “sugar scoop” profile of their housings. These are among Spencer’s oldest products, so the sugar scoop profile is your visual assurance of genuine Spencer quality that has endured for more than a century.
These blowers are manufactured of heavy gauge, cold-rolled sheet steel with a tensile strength of 50,000 psi, welded and reinforced, creating an extremely rugged construction. The inlet, outlet and housing are built as an integral structure for greater strength. The fabricated construction allows easy substitution of other metals to counter very high temperatures, chemical or corrosive conditions. We routinely use Hastelloy®, monel, various stainless steels, aluminum, Cor-Ten® steel and many others that provide specialized abilities.
The rotating impeller assembly within the blower housing has ample clearance, 1/8″ or more, for simple, low-maintenance operation. The entire rotor assembly is dynamically balanced to ensure mechanical operation below 1.5 mils total amplitude on the bearing housing at design speed. With housing diameters from 14″ to 88″, these blowers can handle volume to 25,000 ICFM, pressure to 20 PSIG and vacuum to 15″ Hg.
1 Standard Overhung (SOH)
The SOH has impellers mounted on an extended motor shaft. The simple two-bearing design reduces maintenance.
Pressure: to 5.5 PSIG
Vacuum: to 8″ Hg
Volume: to 7,000 ICFM
Power: to 150 HP
2 Four Bearing Overhung (4BOH)
Impellers are mounted on the blower shaft, which is coupled to a standard shaft motor. Rotating elements are supported by a rigid bearing bracket. Also available in a belt drive option so the output can be varied or matched to a process by changing pulley sizes.
Pressure: to 8 PSIG
Vacuum: to 10″ Hg
Volume: to 9,000 ICFM
Power: to 300 HP
3 Four Bearing Outboard (4BOB)
For higher pressure applications. Impellers are mounted between supporting bearings. Outboard bearings are a matched set, one for radial loads, the other for thrust loads. Inboard bearing absorbs a share of the radial load. The blower is coupled to a standard shaft motor or a belt drive can be optionally furnished.
Pressure: to 20 PSIG
Vacuum: to 14″ Hg
Volume: to 15,000 ICFM
Power: to 1250 HP
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