Specification Sheet

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 specications 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