Specification Sheet
Table Of Contents
368
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 spring mechanism (HT1 unit only).
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. Belt tube and cover standard.
9. Die formed, heavy-gauge, epoxy coated, steel blades.
10. High temp grease.
Drives
Motors, bearings and belt are shielded from the airstream by a sheet metal enclosure, with cooling provided by
fresh outside air. Drives are xed, sized for a minimum 150% of drive horsepower. Drives are minimum dual
groove sheaves. Adjustable sheaves are available as an option. Bearings are heavy-duty cast iron, pillow block
with relubricable ttings. Standard bearings are designed for minimum 200,000 hour, L50 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.
High Temperature Option
500ºF (260ºC) for a minimum of 4 hours
1000ºF (538ºC) for a minimum of 15 minutes
This construction exceeds specications for IRI requirements of 500ºF (260ºC) air for a minimum of 4 hours and
the SBCCI “Standard Fire Prevention Code” requirements of 1000ºF (538ºC) for a minimum of 15 minutes in
emergency smoke removal applications. In addition, this construction exceeds British Standards 7346 Class B
(250ºC for 2 hours), Class C (300ºC for 15 minutes), and Class D (300ºC for 1 hour) temperature requirements.
Temperature ratings tested in accordance to UL smoke control systems.
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.
Disconnect Switch: Nonfused safety disconnects are available for all motor sizes in rain-tight or open enclosures.
Outlet Guard: 1/2” x 1” wire mesh guard will prevent birds and other objects from entering fan.
Propeller Blade Side Safety Guard: ½ x 1” galvanized wire guard. Important: For all nonducted applications,
the manufacturer recommends that a safety guard must be installed as a safety precaution for personnel below
unit.
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.
MODELS UBSRD-HT & UBSRD-HT1
REMOTE DRIVE UPBLAST PROPELLER ROOF EXHAUSTERS FOR HEAT AND SMOKE REMOVAL