| MODEL UBS BELT DRIVE UPBLAST PROPELLER ROOF EXHAUSTERS
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Application
Model UBS is a high capacity roof mounted exhauster rated from 7,000 to 51,000 CFM.
They are general ventilation units designed to economically remove large volumes of air, fumes and vapors from commercial and industrial buildings such as warehouses, manufacturing and assembly plants, chemical plants, foundries and paper mills.
Straight-through air flow design results in maximum exhaust efficiency. During operation, the high air flow velocity opens
butterfly dampers and helps prevent rain or snow from entering. Dampers close and cover the venturi opening when unit is not
in use.
The roof mounted location eliminates interference with processes and equipment inside the building. It also permits locating the exhauster over a source of heated or contaminated air, allowing direct upward venting to the outside, unlike wall mounted exhausters which may move contaminated air through adjacent work spaces. Belt drive units usually operate more quietly and afford easier performance adjustments, while direct drive models require less maintenance.
Construction/Specification Checklist
Panel Assembly
• Heavy-gauge G90 galvanized steel panel on all sizes.
• One piece venturi for maximum efficiency.
• Welded and bolted support structure of schedule 40 galvanized pipe.
• Motor/bearing plates of minimum 10 gauge galvanized steel.
• Lifting eyes standard for ease of installation.
Windband/Butterfly Dampers
• Heavy-gauge galvanized steel windband.
• Galvanized steel butterfly dampers standard.
• Galvanized rain channel drains water from damper area to roof.
• Corrosion resistant.
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Propeller
• Steel hub plate with steel taper lock bushing.
• Die formed, heavy-gauge, epoxy coated, steel blades.
Drives
• Sized for minimum 150% of drive horsepower.
• Single belt adjustable pitch sheaves through 3HP.
• Two belt fixed pitch sheaves on 5HP and 7 1/2HP units.
• Adjustable tension rods for belt adjustment.
• Nonstatic oil resistant V belts.
• Keyed, turned, ground and polished shafts.
Bearings
• Bearings designed for minimum 200,000 hour life.
• Cast iron self-aligning pillow block ball bearings.
• Bearings are sealed, prelubricated with relube fittings.
Motors
• Brands are nationally recognized and locally serviced.
• Open drip-proof construction is standard.
Options/Accessories
Roof Curb: Prefabricated heavy-gauge galvanized steel, welded construction, 12’’ high with 1 - 1 / 2’’ treated wood nailer. Options include burglar bars, single and double pitch construction, and additional curb heights.
Disconnect Switch: Nonfused safety disconnects are available for all motor sizes in rain-tight or open enclosures. Explosion Proof, Nema 4 and Nema 4X are also available.
Magnetic Latches: Help reduce butterfly damper chatter when the units are not in operation.
Cushion Close: Allows butterfly damper doors to close quietly.
cULus Standard 705 Listing: Assures electrical safety and reliability. Optional.
Safety Basket Guard: 1/2’’ x 1’’ galvanized welded wire. Recommended as a safety precaution for personnel below unit. Guard extends into roof curb.
Extended Grease Lines: Extended nylon grease lines allow motor and /or fan bearings to be relubricated from the exterior of the fan housing. |
