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Broan Model QTXE110SFLT Ultra Silent Humidity Sensing Bath Fan with Fluorescent Light, Nightlight.  110 CFM, .9 Sones, 6" ducting.

Sensaire® technology detects rapid increases in moisture levels at the ceiling, where steam and humidity naturally rise. Regular humidistats located on the wall simply detect absolute humidity levels and are prone to false triggers, or not operating when they should.
- An automated solution to fight excess humidity and mold.
Our humidity sensing fans turn on and off automatically to help prevent cosmetic and structural problems associated with excess moisture.
- Adjust the sensitivity level and run-time.
Just beneath the drop-down grille are easy-to-adjust sensitivity and run-time controls. Choose your preference, set with a screwdriver and forget it. Of course, you can always override the sensor at the touch of a switch.
- Remains ON for a user-adjustable 5 to 60 minutes after humidity has stabilized and is below set-point or after manually initiated through power line cycling
- Hands-free operation.
Since you never have to worry about turning the fan on, Broan Ultra SilentT is ideal for problem areas in residential, institutional and light-commercial applications. Our exclusive Sensaire® technology is a perfect solution for high-traffic bathrooms, or a kid's bathroom.
- It turns off automatically, and that saves money.
Humidity sensing fans are ideal for anyone who leaves the house before humidity is properly vented. With a fan this quiet, you can't forget to turn it off when the job is done. That saves energy and money.

FEATURES

LIGHTS:
. 42 watt fluoresent light (included) and 4 watt nightlight (not included)

BLOWER:
. Plug-in, permanently lubricated motor - engineered for continuous operation
. Dynamically balanced centrifugal blower wheel for quiet, efficient performance
. Maintains a high percentage of rated CFM in less than ideal installations
. Low RPM for quiet operation
. Resilient anti-vibration motor mounts
HOUSING:
. Rugged, 26 gauge, galvanized steel construction
. 6" round ducting for superior performance
. Polymeric duct connector with tapered sleeve and no metallic clatter
. 7-5/8" height allows for 2" x 8" (nominal) joist installations
. Sturdy, easy, four-point mounting directly to joist
. Includes unique spacer (patent pending) for mounting to engineered "I" joists
. Includes hanger bars to position housing anywhere between 16" to 24"-on-center joists
. Two sets of mounting holes for hanger bars allow flush installation with bottom or top of drywall
GRILLE:
. Integrated humidity sensor
. Polymeric construction
. Innovative design - the result of extensive research with designers and consumers
AUTOMATIC CONTROL:
. Humidity control automatically turns fan ON when either of these conditions is detected:
- a rapid to moderate (user adjustable) increase of humidity
- humidity above user-adjustable set-point (50%-100% RH)
. Two wire manual operation for odor control - Turns fan ON when power line through wall switch is cycled ON, OFF and back ON
. Remains ON for a user-adjustable 5 to 60 minutes after humidity has stabilized and is below set-point or after manually initiated through power line cycling
. Saves energy because unit runs only for the time required. A unit controlled with a wall timer may keep fan ON longer than required or turn it OFF before room is sufficiently ventilated