Specification Sheet

389
CONSTRUCTION/SPECIFICATION CHECKLIST
1. Successfully heat tested by independent
laboratory for:
(a) 1000°F for 15 minutes.
(b) 500°F for minimum 4 hours.
2. All ferrous construction in airstream.
3. 165°F fusible link in damper mechanism
(heat & smoke vent).
4. Motor out-of-airstream design.
5. Belt & bearings enclosed in ventilated housing.
6. Minimum dual groove drive/belt combination.
7. Shaft heat slinger.
8. Extended lubrication lines.
9. UL-793 Listed Power Ventilator for Smoke
Control Systems.
10. Meets UL-793 snow load test.
Drives
Motors, bearings and belt are shielded from the airstream by a sheet metal enclosure, with cooling
provided by fresh outside air. Drives are sized for a minimum 150% of drive horsepower. Drives are
minimum dual groove sheaves through 10 horsepower and three-belt on 15HP. Adjustable sheaves are
available as an option. Bearings are heavy-duty cast iron, pillow block with relubricable ttings. Standard
bearings are tted with remote relubricable ttings and designed for minimum 200,000 hour life. All
shafts are turned, ground and polished steel coated with an anti-rust compound to resist corrosion.
Electrical Power
Electrical power should be independent of the general building. Wiring requires special, heat resistant
qualities as determined by local re codes. Switching should always be arranged so that automatic
start-up can be achieved through safety devices such as, but not limited to, sprinkler systems and
smoke or heat sensors.
OPTIONS/ACCESSORIES
Roof Curb: Prefabricated heavy-gauge galvanized steel, welded construction, 12” high
with 1-1/2” wood nailer. Options include burglar bars, single and double pitch construction,
and additional curb heights.
Outlet Guard: 1/2” x 1” wire mesh guard will prevent birds and other objects from entering fan.
Inspection Door: For inspection and blade service/cleaning.
Disconnect Switch: Nonfused safety disconnects are available for all motor sizes in rain-tight or open
enclosures.
Special Coatings: Powered roof exhausters often require special coatings for protective and decorative
purposes. Available coatings include: Synthetic Resin, Epoxy, and Heresite (air-dried phenolic). Contact
your representative or the factory for more information on available coatings and colors.
MODEL TUB-HT
TUBEAXIAL UPBLAST PROPELLER ROOF EXHAUSTER FOR HEAT AND SMOKE REMOVAL