1. Wheel must be free to rotate and should not strike or rub any stationary object.
2. Follow all local electrical and safety codes, as well as the National Electrical Code (NEC), the Occupational Safety and Health Act (OSHA), and the National Fire Protection Association (NFPA) Bulletin 96, where applicable.
3. Motor must be securely and adequately grounded.
4. Fan wheel should not run at speeds higher than specified for motor furnished (see product catalog) with the ventilator at any given HP. Adjustments to fan speed significantly effect motor load. If the fan RPM is changed, the motor current should be checked to be sure it is not exceeding the motor nameplate amps.
5. Always disconnect power before working on or near a fan. Lock and tag the disconnect switch or breaker to prevent accidental power up.
6. Caution-when servicing fan, motors may be hot enough to cause pain or injury. Allow motor to cool before servicing.
7. Secure the power cable to prevent contact with sharp objects.
8. Do not kink power cable and never allow the cable to come in contact with oil, grease, hot surfaces or chemicals.
9. Make certain that the power source is compatible with the requirements of your equipment.
10. Wiping or cleaning rags and other flammable waste materials must be placed in a tightly closed container and disposed of later in a proper fashion.

1. Ventilators are designed for installation atop a prefabricated or factory built roof curb. Follow manufacturer’s instructions for proper curb installation.
2. If a backdraft damper is required, it should be secured within the curb using sheet metal screws, to the bottom of a damper box or damper support flanges located below the roof deck. CAUTION: NFPA-96 RECOMMENDS THAT DAMPERS SHOULD NOT BE INSTALLED WHEN EXHAUSTER IS USED FOR REMOVAL OF SMOKE AND GREASE LADEN VAPORS FROM COMMERCIAL KITCHEN EQUIPMENT. CONSULT STATE AND LOCAL CODES FOR DETAILED REQUIREMENTS.
3. If fan is used for kitchen hood exhaust ensure discharge is at least 40 inches above the roof surface in accordance with NFPA96.
4. Normally the power cord is brought through the conduit tube located on the top skirt on the outside of the unit.
5. Secure ventilator 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).
6. Before connecting fan motor to power source verify power line wiring is de-energized.
7. Connect power supply wiring to the motor as indicated on the motor nameplate or terminal box cover. Make certain that the power source is compatible with the requirements of your equipment.
8. Before powering up fan check ventilator wheel for free rotation.
9. Check all fasteners for tightness.
10. Re-install motor dome.
11. A drain pipe is provided for single-point drainage of water and residue. The drain pipe should be positioned towards the roof slope. Some means for collection of this residue must be provided, either a container directly under the trough or use of an adapter and pipe to carry the residue to a remote collection point.

1. The same instructions, warnings and notes found under Roof Mounting section will apply. Refer to steps 2 and 3, and steps 5 through 8.
2. Masonry Wall:

   Around the wall opening install an angle iron frame at least 2” x2” x ¼”. Frame should be approximately 1/2” smaller than the inside base dimension of the ventilator. Secure the lead cinch type anchors with non-ferrous bolts (3 per side). The ventilator should be mounted to the mounting angle with self-taping sheet metal screws (3 per side).

3. Wood Sidings:

   Around the wall opening install a wooden frame 2” high x 2” wide. Frame should be approximately 1/2” smaller than the inside base dimension of the ventilator. Secure with counter-sunk expansion type lag bolts (3 per side). The ventilator should then be mounted to the mounting frame with the square head wood screws (3 per side) 3/8” minimum.

NOTE: If factory supplied hinge kit is used make wall mounting frame 1-1/2” smaller that fan base dimension to accommodate hinge assembly.
4. The mounting flange connections should be coated with a suitable caulking compound or an approved waterproof mastic sealer.
5. Wall mount application is not recommended from fans 30” or larger.

1. Before starting up or operating the ventilator, check all fasteners for tightness. In particular, check the set screw in the wheel hub, bearings and the fan sheaves (pulleys). With power to the fan OFF or prior to connecting ventilator to power, turn the fan wheel by hand to be sure it is not striking the inlet or any obstacles. Re-center if necessary.
2. Start the fan up and shut it off immediately to check rotation of the wheel with the directional arrow in the motor compartment. Fan wheel should rotate counter-clockwise when viewed from the top. Reversed rotation will result in poor air performance, motor overloading and possible burnout. For units equipped with a single-phase motor check the motor wiring diagram to change rotation.
3. When the fan is started up, observe the operation and check for any unusual noises.
4. Measure fan speed with a reliable tachometer. Motor sheave (pulley) is variable pitch, and allows for adjustment down from the RPM shown in the catalog. Excessive speed will result in motor overloading.
5. With the air system in full operation and all ducts attached, measure the current input to the motor and compare with the motor nameplate to determine if the motor is operating under safe load condition.
6. Once the rpm of the ventilator has been properly set, disconnect power and recheck belt tension and pulley alignment as described below.
7. Keep inlets and approaches to the ventilator clean and free from obstruction.

In order to adjust the pulley there is an adjustable sheave on the motor. There are two hex set screws on the pulley. One secures the pulley to the shaft. The other allows the two halves of the pulley to be adjusted closer together or further apart. Be sure when adjusting retighten the set screws on a flat side of the pulley base. Adjusting the halves closer together increases the fan speed, further apart slows it down. Double grove pulleys must be turned the same number of turns or the belts will not seat properly in the groves. Always check motor amperage after adjusting pulleys.

1. Fan inlet and approaches to ventilator should be kept clean and free from any obstruction.
2. Motors are permanently lubricated. Check bearings periodically, if they have grease fittings lubricate each season. Use caution when lubricating bearings, wipe the fittings clean, the unit should be rotated by hand while lubricating. Caution: Use care when touching the exterior of an operating motor. Motors normally run hot and may be hot enough to be painful or cause injury.
3. Belt tension should be checked after two days of fan operation and each season thereafter. See instructions elsewhere in this manual. Over-tightening will cause excessive bearing wear and noise. Too little tension will cause slippage at startup and uneven wear.
4. To remove motor or Impeller:
   1. Remove motor hood, cooling tube, and electric wire from switch or junction box.
   2. Remove the fastening bolts and nuts that secure the top plate to the supporting braces and remove the entire assembly from the housing.
   3. Loosen setscrew(s) on wheel hub to slip fan impeller from shaft.
   4. To remove motor, remove retaining bolts and nuts on motor mounting plate (motor bracket).
5. Wheels require very little attention when moving clean air. Occasionally oil and dust may accumulate causing imbalance. If the fan is installed in a corrosive or dirty atmosphere, periodically inspect and clean the wheel, inlet and other moving parts to ensure smooth and safe operation.
6. All fasteners should be checked for tightness each time maintenance checks are preformed prior to restarting unit.