Specification Sheet
Table Of Contents
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