Delta Electronics VFB25ADH Breez 110 CFM Humidity Sensor Exhaust Fan

Item #: BCI1121979
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Technical Specs

Installation Guide
CAD Sheets
Specification Sheet
What comes in the box?
Amperage 0.22
CFM 110
CFM (High) to Sones 110 to 1
Collection BreezSignature
Configuration Bath Fans
Duct Size 4" Round
Energy Star Yes
Grille Length 12.36
Grille Shape Square
Grille Width 12.36
Heater Included No
Housing Depth 7.98
Housing Length 9.68
Housing Shape Square
Housing Width 9.68
Humidity Sensing Yes
HVI Certified No
Installation Type Ceiling
Light Included No
Material Galvanized Steel
Night Light No
Series BreezSignature
Sones 1
Speeds 1
UL Listed Yes
Voltage 110
Wattage 16.2

Delta Electronics VFB25ADH Breez 110 CFM Humidity Sensor Exhaust Fan, 1 Sone

Extra Savings on Installation - NO Special Switch or Wiring Needed!

NOTE: in Humidity Sensor Mode, fan runs continuously as long as ambient relative humidity is above 50%. 

  • Highly efficient DC Motor, noise level less than 1 Sone
  • Cycle switch ON/OFF for humidity sensor mode and full speed mode
  • Annual energy cost for 24/7 operation is approximately $15.51
  • Motor self-adjusts to humidity levels
  • Blue and amber LED indicator lights to show humidity sensor mode and full speed mode

Innovative design for long life, low noise and low power consumption, the Delta Breez humidity sensor exhaust fan model VFB25ADH delivers air flow rate of 110 CFM at 1 Sone. Power consumption is only 16.2 Watts with an efficiency rating of 6.79 CFM/Watt. The life expectancy for this fan is 70,000 hrs, which is about 8 years running continuously. This quiet energy efficient bathroom fan combines several design innovations, including a switching power supply that converts AC 110~220V power source to DC power to drive a DC brushless motor. This design provides a quieter solution with energy savings up to 65% compared to traditional AC motor products.  Users can cycle switch on/off for humidity sensor mode and full speed mode. This product has a default humidity threshold setting of 50% humidity environment. In humidity sensor mode, fan will kick in when the humidity level reaches 50% and above, and will turn off automatically after the humidity level comes back down to lower than 50%. The motor will adjust the speed according to humidity levels. When humidity level is high, the fan will spin faster to quickly exhaust the moisture. When humidity level is low (but still higher than 50%), the fan will run at a lower speed, which allows you to continue to vent for better indoor air quality. This product also incorporates a dual color (blue and amber) LED indicator to show if it is running at humidity sensor mode or full speed mode.

Because of the effects it has on health, comfort, and serviceability, indoor air quality in our homes is becoming an increasing concern to many people. The American National Standards Institute (ANSI) has recommended a mechanical exhaust system to be installed in your home to provide whole building air ventilation (ASHRAE Standard 62.2-2007) in order to improve indoor air quality. This Delta Breez VFB25ADH humidity sensor exhaust fan is an excellent product to achieve this goal with its superior features of ultra low power consumption, and almost silent operation. Cycle switch on/off in between humidity sensor mode and full speed mode for continuous or smart operation. The energy cost for operating this fan 24/7 for an entire year is less than approximately $15.51.

Power rating of 110~220volts/50~60Hz; DC Brushless motor equipped with thermal cutoff fuse; Galvanized steel body housing; Detachable 4” diameter duct adapter; Built in back draft damper; Easy installation; Housing dimensions (LxWxD) = 9.68" x 9.68" x 7.98"; Grille dimensions = 12.36" x 12.36"; Attractive grille design using ABS material; Grille attaches directly to housing with torsion springs; UL and cUL listed for tub/shower enclosure when used with GFCI branch circuit wiring; DC motor technology provides built in soft start function to reduce motor start noise and automatically powers OFF when impeller is locked abnormally; 3 year limited warranty.

Additional Delta Electronics Links


This product is listed under the following manufacturer number(s):

  • VFB25ADH

*Denotes a finish or option that has been discontinued

7 Questions from the Community

  • What are the sones on this fan?

    A. This item is just below 1 Sone.

    65% of 37 people found this useful. Was this useful? yes (24) | no (13)
  • I would like some details on how the humidity sensing works. Do you just leave it "on" all the time and then it switches on and off depending on the humidity?

    A. You are correct. As long as it is set to on, if the humidity reaches above a set point, the fan kicks on. The set point is at 50% humidity and not adjustable. Typically, after someone takes a shower or bath, the fan continues to run until the air in the room is de-humidified. Of course, the humidity sensing feature can be set to off, as well. The conventional wall switch toggles the humidity sensing feature on and off.

    62% of 42 people found this useful. Was this useful? yes (26) | no (16)
  • The flange on the fan housing would rest against the sheetrock on the room side ? I am trying to replace an existing fan the Delta. Also how do you overide the humidity sensor if you want to run the exhaust fan manually?

    A. Yes, the metal flange of the fan box will contact the drywall when installed. The humidity sensor can easily be overridden by simply cycling the wall switch. Turning the switch on will power the VFB25ADH in Humidity Sensing mode, and cycling the switch on/off/on will override the sensor and power the fan in full-speed mode. No special controls are needed.

    83% of 18 people found this useful. Was this useful? yes (15) | no (3)
  • we live on the coast, how will the outside housing stand up to the constant salt air?

    A. The Delta Electronics VFB25ADH external housing is made of high-quality plastic, that is not affected by salt air.

    22% of 9 people found this useful. Was this useful? yes (2) | no (7)
  • What do you recommend for a bathroom fan to prevent mold build up on the walls from the shower?

    A. Its you have moisture build up, it might be a good idea to increase the fan CFM or get a dehumidifier for the room.

    43% of 7 people found this useful. Was this useful? yes (3) | no (4)
  • the install sheet says Do not install this ventilating fan where air temperature may exceed 40 degreese c. Does this mean not to put it in my attic where tempature will exceed this tempature or is this talking about thempture of the exhausted air?

    A. It is referring to the temperature of exhausted air.

    56% of 9 people found this useful. Was this useful? yes (5) | no (4)
  • what is the grille made of?

    A. The Delta Electronics VFB25ADH grille is ABS material like pvc pipe. Acrylonitrile Butadiene Styrene. Thank you for the question. You can reach me by email (which is quickest) or on ext. 341. Have a wonderful day and happy home improving!

    0% of 3 people found this useful. Was this useful? yes (0) | no (3)

Product Reviews

Warranty Info


Delta Electronics Inc. ("Delta Electronics") warrants to that the Breez ventilation fan products will be free from defects in material or workmanship. This warranty is limited to three (3) years from the original date of purchase.

Limitations and Exclusions

1. During the warranty period, a replacement for any defective product will be supplied free
of charge for installation by the consumer. The warranty provided herein does not cover
charges for labor or other costs incurred in the troubleshooting, repair, removal, and
installation service.

2. All returns of defective parts or products must include the product model number, and
must be made through an authorized Delta Electronics distributor. Authorized returns
must be shipped prepaid. Repaired or replacement products will be shipped by Delta
Electronics F.O.B. shipping point.

3. Delta Electronics shall not be liable for any indirect, incidental, consequential, punitive, or special damages arising out of or in connection with products use or performance,
regardless of the form of action whether in contract, tort (including negligence), strict
product liability or otherwise.

4. This warranty does not extend to fluorescent lamp starters and tubes.

5. The warranty does not cover if user does not comply with manufacturers installation

6. To qualify for warranty service, you must notify Delta Electronics at the address or
telephone number below.

7. Delta Electronics shall have no liability to the original owner-user with respect to any
defect caused by abuse, misuse, neglect, improper transportation or storage, improper
testing, improper installation, improper operation, improper use, improper maintenance,
improper repair, improper alteration, improper modification, tampering or accident of
products or parts thereof, or unusual deterioration or degradation of products or parts
thereof due to a physical environment beyond the requirements of products'


Delta Electronics, Incorporated
4405 Cushing Parkway
Fremont, CA 94538

US Toll Free Number: 1-888-979-9889

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