Specification Sheet

433
Type: UTILITY VENT SET
Type of Wheel: Backward Inclined
Rotation: CW and CCW
Sizes: 10, 12, 14, 16, 18, 20, 22, 24, 27, 30, 36
Construction
Housing & Drive Frame Structure
The unit is solidly built, housing joints are welded
intervals (continuous welding on request, contact
factory for availability and delivery schedules), this
provides greater strength, accuracy on the boards and
makes a robust unit, which is an added value.
Wheel
Backward inclined centrifugal wheel is constructed
of steel blades protected with a polyester powder
coat nish. All wheels are statically and dynamically
balanced to ISO 1940 and AMCA 204-G2.5 standards.
Paint
The unit is subjected to a coil coating process, where
the steel is treated chemically to ensure the adherence
of the polyester paint. Subsequently, powder coating
is bonded to the parts through an electrostatic
process, where after baking the piece takes on its
highest characteristics corrosion resistance, with great
adhesion properties and impact resistance.
Shafts and Bearings
Turned, ground and polished allow steel shafts sized
so the rst critical speed is at least 30% over the
maximum operating speed. Standard bearings are
heavy-duty, self-aligning pillow block ball bearings
with minimum L10 life in excess of 100,000 hours at
maximum cataloged operating conditions.
Motors
Heavy-duty ball bearing motors are factory mounted
on an adjustable base for ease of service and belt
maintenance. Standard motor enclosures are
available as Open Drip Proof (ODP), Totally Enclosed
Fan Cooled (TEFC), and Explosion Proof.
Drives
V-belt drives are selected for a minimum safety factor
of 150% of the driven horsepower. Cast iron motor
pulleys are adjustable for nal system balancing and
are factory set to the required RPM range. Dual groove
v-belt drives are standard for motors 5 HP thru 10 HP.
Three groove v-belt drives are standard on 15 HP units.
Temperature
Standard operating temperature range for cULus
705 units is -20°F to 200°F. For fans with cULus 762
construction the range is -20°F to 400°F. For CM-HT
models with cULus 793 listing for emergency heat and
smoke removal, designed and UL Listed to withstand
inlet temperatures of 500°F for 4 hours and 1000°F for
45 minutes.
cULus 762 Fan Installation
Model CM is available with the 762 grease listing from
UL. The fan will operate with continuous airstream
temperatures of 400°F. Per NFPA 96, the fan discharge
must be at least 40 inches above the roof line and the
duct must be of all welded construction with a minimum
distance of 18 inches above the roof line.
CONSTRUCTION/SPECIFICATION CHECKLIST
MODEL CM
BELT DRIVEN UTILITY VENT SET