do you need to have a switch?
Yes, it is highly recomended that you use a switch. This has more than one setting and to be able to use this effeciently and to it's full capacity, you must use a switch.

Extra Savings on Installation - NO Special Switch or Wiring Needed!
Innovative design for long life, low noise and low power consumption, the Delta Breez humidity sensor exhaust fan model VFB25ACH delivers air flow rate of 80 CFM at <0.3 Sone. Power consumption is only 8 Watts with an efficiency rating of 10 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 VFB25ACH 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 $7.62.
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.
This product is listed under the following manufacturer number(s):
*Denotes a finish or option that has been discontinued
Yes, it is highly recomended that you use a switch. This has more than one setting and to be able to use this effeciently and to it's full capacity, you must use a switch.
Most likely not because most ceilings are sloped.
The Delta Electronics VFB25ACH is designed for ceiling installations only.
The Delta Electronics VFB25ACH is not adjustable. It is fixed to actuate the fan at 50% or higher relative humidity. (Note: Early models were pre-set at 40%.)
The Delta Electronics VFB25ACH is pre-programmed and will run at humidity levels higher than 50%. (Early models were pre-set at 40%.)When they are lower than that, the fan runs slower.
The Delta Electronics VFB25ACH does have a built in back draft damper.
The Delta Electronics VFB25ACH will work with a standard light switch.
The Delta Electronics VFB25ACH is pre-set to run when the humidity is higher than 50%. (Note: Early models were pre-set at 40%.) You can also turn it on and off manually by toggling the wall switch.
The Delta Electronics VFB25ACH is UL and cUL listed for tub/shower enclosure when used with GFCI branch circuit wiring.
CFM stands for "Cubic Feet per Minute" and is a measurement of how much air this product moves. Sones are a measurement of sound, this particular product is very quiet.
| Amperage | 0.12 |
|---|---|
| CFM | 80 |
| CFM (High) to Sones | 80 to .3 |
| Collection | BreezSignature |
| Configuration | Bath Fans |
| Duct Size | 4" Round |
| Energy Star | Yes |
| Grille Length | 12.36 |
| Grille Width | 12.36 |
| HVI Certified | No |
| Heater Included | No |
| Housing Depth | 7.98 |
| Housing Length | 9.68 |
| Housing Width | 9.68 |
| Humidity Sensing | Yes |
| Light Included | No |
| Night Light | No |
| Series | BreezSignature |
| Sones | 0.3 |
| Speeds | 1 |
| UL Listed | Yes |
| Voltage | 110 |
| Wattage | 8 |
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