FloAire NSA - Manual (Page 4)

4
Recommended Supply Ductwork Sizes
Blower Size Duct Size Straight Duct Length
10 14 x 14 48 in.
12 16 x 16 54 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 OR
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 fan inlet shall be located in accordance with the
applicable building code provisions for ventilation air.
Intake Assembly
Filters and intake hoods for standard supply fans are shipped inside the supply fan housing for protection
during shipping. Modular intakes are shipped on a separate skid. Upon unit arrival, follow the following
procedure to assemble the intake to the fan:
1. Remove the fan top (standard supply fans
only).
2. Remove the intake hood and filters from the
fan housing.
3. Re-install the fan top (standard supply fans
only).
4. Apply silicone or weather-proof gasket on the
back side of the flanges of the intake hood.
5. Screw the flanges of the intake hood to the
unit at the hatched areas shown with the
supplied sheet metal screws. Place caulk on
the outside of the screws to prevent water
leaks. Slide the filters down the filter track as
shown.
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 to the right shows the minimum
fan outlet duct sizes and straight lengths
recommended
for optimal fan performance.
SUPPLY FAN
INTAKE HOOD
FILTER(S)
FAN TOP