Make-Up Air Units

ADDITIONAL INFO LINKS
PERFORMANCE
INLINE SERIES
DIMENSIONAL DATA

NSAU SERIES

FEATURES

• UL Listed
• Flexible designs provided with 6 blower/housing combinations to meet performance specifications.
• Standard units designed for Roof Mount applications. (External wall mount is optional). Designs available for Internal duct mounting - (refer to Inline Series contained herein)
• Heavy duty galvanized construction eliminates rusting
• Pre-wired external disconnect switch
• Heavy duty motor mounting bracket, easily adjustable
• Variable pitch motor pulley for RPM adjustment
• Ball bearing, belt drive assembly for blower and motor
• Heavy duty blowers with sealed ball bearings
• Built-in thermal overload protection (single phase motors - 1/3 to 1-1/2 HP)
• Single phase motors rated at 115/208-230 volt. Three phase motors rated at 208-230/460 volt
• UL Recognized, quality motors
• Compact design
• Easily removable and washable UL Listed Class 2 mesh filters
• Minimal installation requirements
• Optional 2-speed or 50 Hz motors available
  

OPTIONAL FEATURES AND EQUIPMENT

GRAVITY DAMPER:
Precision built shutters. Vanes open when fan comes on and
close when air flow stops. Counter-balanced steel reinforced
vanes felted for quite operation. Tie rod attached to vanes on fan side. 9/32" Diameter mounting holes.

MOTORIZED DAMPER:
Extruded aluminum frame and blades. 1/2 Blade design increases free area. Nylon Bearings. Delrin linkage pivot pins. Aluminum blade pivot pins/PVC foam gasketed blade for silent operation. Offset pivoting of blades. Full 90 degree, 100% sparkproof.

EXTERNAL WALL MOUNT:
In lieu of curb, two (2) angle iron
mounting brackets are supplied





SIDE DISCHARGE:
Air discharge on NSAU units will
be located 180 degrees from the air inlet.
Optional roof curb or rails (2 rails required).

TRUNKLINE:
A galvanized trunkline can be provided if required to meet NFPA 96 regulations. NFPA 96 requires the make-up air intake to be located a minimum of 10' from the exhausting fan. An aluminized equipment rail will be provided for support.

CURB:
An optional curb is available, either pitched
or flat, depending on roof design.

SPECIFICATIONS:
EMPIRE Systems, Inc. MAKE-UP AIR UNITS ARE LISTED BY UNDERWRITERS LABORATORIES. The components are as follows:

• HOUSING: Fabricated of galvanized metal and assembled with heavy duty fasteners for durability. Designed to slip over and counter flash to an optional curb.
• FILTRATION: Unit designed with easily removable and washable UL Listed Class 2 aluminum mesh filters. Filter media is composed of layers of slit and expanded aluminum, varying in pattern to obtain maximum depth loading.
• BLOWER: Heavy duty squirrel cage, forward curved, downblast blower with sealed ball bearings. Blower wheel has an exclusive center disc construction for improved safety. Shafts are finely polished for quiet, trouble free operation and are coated with a corrosion resistant material. Units are equipped with cast iron pulleys and heavy duty belts.
• MOTORS: UL Recognized motors are an open drip-proof design. Motors are sized for required CFM delivery and static pressure. Automatic reset/thermal overload protection on single phase motors (1/3 to 1-1/2 HP) and on three phase motors if a pre-wire assembly is included in the specifications. A heavy duty, easily adjustable motor mount bracket is attached to the blower housing by means of a nut and bolt assembly. It is utilized to avoid motor contact with the housing during shipment and operation, thus precluding potential housing damage and excessive vibration.
• WIRING: Unit is factory pre-wired with the input power connection dropping through the bottom of the unit, eliminating pitch pocket requirements. Wiring for the fan motor is run through an optional service disconnect switch and connected to the motor through flexible conduit. Optional motor starters, if required, can be installed in the EMPIRE Systems, Inc. custom wiring package, mounted in the EMPIRE Systems, Inc. hood's utility cabinet. Field wiring is required from the pre-wired controls to the fan.
• CURB: An optional curb is available either pitched or flat, depending on the roof design.