WARNING 
TO REDUCE THE RISK OF FIRE, ELEC- TRIC SHOCK, OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:
1.Use this unit only in the manner intended by the manufacturer. If you have questions, contact the manufacturer at the address or telephone number listed in the warranty.
2.Before servicing or cleaning unit, switch power off at service panel and lock the ser- vice disconnecting means to prevent power from being switched on accidentally. When the service disconnecting means cannot be locked, securely fasten a prominent warning device, such as a tag, to the service panel.
3.Installation work and electrical wiring must be done by a qualified person(s) in accordance with all applicable codes and standards, including fire-rated construction codes and standards.
4.Sufficientairisneededforpropercombustion and exhausting of gases through the flue (chimney) of fuel burning equipment to pre- vent backdrafting. Follow the heating equip- ment manufacturer’s guideline and safety standards such as those published by the
National Fire Protection Association (NFPA), and the American Society for Heating, Re- frigeration and Air Conditioning Engineers
(ASHRAE), and the local code authorities.
5.When cutting or drilling into wall or ceiling, do notdamageelectricalwiringandotherhidden utilities.
6.Ducted fans must always be vented to the outdoors.
7.Acceptableforuseoveratuborshowerwhen connected to a GFCI (Ground Fault Circuit Interrupter) - protected branch circuit.
8.This unit must be grounded.
CAUTION 
1.For general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors.
2.This product is designed for installation in flat ceilings only. DO NOT MOUNT THIS PRODUCT IN A WALL.
3.To avoid motor bearing damage and noisy and/or unbalanced impellers, keep drywall spray, construction dust, etc. off power unit.
4.Please read specification label on product for further information and requirements.
Installer: Leave this manual
with the homeowner.
OPERATION
The humidity control and fan can be oper- ated separately. Use a 1- or 2-function wall control. Do not use a dimmer switch to operate the humidity control or light. See “Connect Wiring” for details.
SENSOR OPERATION
The humidity-sensing fan uses a sophis- ticated humidity sensor that responds to:
(a)rapid to moderate (user-adjustable) increases in humidity or (b) humidity above a user-adjustable set-point (50%-100% relative humidity). The humidity sensor may occasionally turn the fan ON when environmental conditions change. If the fan continuously responds to changing environmental conditions, “SENSITIVITY” adjustment may be required.
MANUAL ON WITH TIMED OFF
The humidity sensing fan has an additional operation feature. For odor or vapor con- trol, the fan can be energized by cycling the power switch. Once the fan has been energized in this manner, it will remain on for the user-adjustable “TIMER” period (5 to 60 minutes). This period is factory-set for 20 minutes.
To manually energize the fan:
1.If fan power switch is already ON, proceed to Step 2; otherwise, turn power switch ON for more than 1 second.
2.Turn fan power switch OFF for less than
1 second.
3.Turn fan power switch back ON and fan will turn ON.
SENSITIVITY ADJUSTMENT
The “SENSITIVITY” has been factory set for most shower applications. However, if the fan is in a tub area or is being used for dampness control, the “SENSITIVITY” may need to be increased toward maximum (“MAX.”). If the control is responding too often to changing environmental conditions, movement toward less (“MIN.”) “SENSITIV- ITY” may be required.
To adjust the “SENSITIVITY”:
1.Disconnect power at service entrance.
2.Through the grille, locate the screwdriver slot marked “SENSITIVITY”.
3.Using a small, flat-blade screwdriver, carefully rotate the “SENSITIVITY” adjustment toward “MAX.” or “MIN.”
4.Turn on power and check operation by turning on the shower or other humidity source until the fan turns on.
5.Repeat above steps if necessary.
TIMER ADJUSTMENT
The humidity sensing fan has a “TIMER” that can be adjusted from 5 to 60 minutes (factory-set at 20 minutes). This “TIMER” controls the length of time that the fan re- mains ON (a) after the sensor has stopped sensing a rise in humidity and the humidity level is below the user-adjustable set-point or (b) after being energized by cycling the power switch.
To adjust the “TIMER”:
1.Disconnect power at service entrance.
2.Through the grille, locate the screwdriver slot marked “TIMER”.
3.Using a small, flat-blade screwdriver, carefully rotate the “TIMER” adjustment to desired setting (from 5 to 60 minutes).
4.Check operation by cycling the power switch as instructed under “MANUAL ON WITH TIMED OFF” or by turning on a humidity source until the fan turns on.
5.Turn humidity source off and time the unit.
6.Repeat above steps if necessary.
CLEANING & MAINTENANCE
For quiet and efficient operation, long life, and attractive appearance - lower or remove grille and vacuum interior of unit with the dusting brush attachment.
The motor is permanently lubricated and never needs oiling. If the motor bearings are making excessive or unusual noises, replace the motor with the exact service motor. The impeller should also be replaced.
SENSOR CLEANING
The humidity sensor is mounted in the grille. The sensor will operate most reliably when cleaned occasionally as follows:
1.Disconnect power at service entrance.
2.Remove the grille. Use a dry dustcloth, clean toothbrush, or lightly vacuum to clean sensor and grille. DO NOT USE ABRASIVE CLOTH, STEEL WOOL PADS, OR SCOURING POWDERS.
3.DO NOT USE cleaning sprays, solvents, or water on or near the sensor!
