FloAire STAGED ELECTRIC HEAT MODULE - Manual (Page 5)

5
Recommended Supply Ductwork Sizes
Blower Size Duct Size Straight Duct Length
10 14 x 14 48 in.
15 20 x 20 72 in.
18 24 x 24 86 in.
20 26 x 26 108 in.
25 32 x 32 168 in.
INSTALLATION
It is imperative that this unit is installed and operated with the designed airflow and electrical supply in
accordance with this manual. If there are any questions about any items, please call the service
department at 1-866-784-6900 for warranty and technical support issues.
Mechanical
WARNING: DO NOT RAISE VENTILATOR BY THE INTAKE HOOD, BLOWER,
MOTOR SHAFT OR BEARINGS – USE LIFTING LUGS PROVIDED OR A SLING
Site Preparation
1. Provide clearance around installation site to safely rig and lift equipment into its final position.
Supports must adequately support equipment. Refer to manufacturer’s estimated weights.
2. Consider general service and installation space when locating unit.
3. Locate unit close to the space it will serve to reduce long, twisted duct runs.
4. Do not allow air intake to face prevailing winds. Support unit above ground or at roof level high
enough to prevent precipitation from being drawn into its inlet. The inlet must also be located at
least 10 feet away from any exhaust vents.
The heater inlet shall be located in accordance with
the applicable building code provisions for ventilation air.
Intake Assembly
Intakes are shipped on a separate skid. Upon unit arrival, follow the following procedure to assemble the
intake to the fan
1. Apply silicone or weather-proof gasket on
the back side of the flanges of the intake
hood or v-bank intake.
2. Screw the flanges of the intake hood to the
unit with the supplied sheet metal screws.
Place caulk on the outside of the screws to
prevent water leaks. If the unit is a modular
unit with a v-bank or evaporative cooler
section, the v-bank or evaporative cooler will
bolt to the heater with the bolts provided.
Curb and Ductwork
This fan was specified for a specific CFM and static pressure. The ductwork attached to this unit will
significantly affect the airflow performance. Flexible ductwork and square elbows should not be used.
Also, transitions and turns in ductwork near the fan outlet will cause system effect and will drastically
increase the static pressure and reduce airflow. The chart below shows the minimum fan outlet duct
sizes and straight lengths recommended for optimal fan performance. Follow SMACNA guides and
recommendations for the remaining duct run. Fans designed for rooftop installation should be
installed on a prefabricated or factory built roof curb. Follow curb manufacturer’s instructions for proper
curb installation. The unit should be installed on a
curb and/or rail elevated not less than 20” above
any surface. Be sure duct connection and fan
outlet are properly aligned and sealed. Secure fan
to curb through vertical portion of the ventilator
base assembly flange using a minimum of eight
(8) lug screws, anchor bolts, or other suitable
fasteners (not furnished). Shims may be required