Technology
Frequently Asked Questions
Delta Group is the world’s largest manufacturer of DC brushless fans – a $6.6 billion global company with 41 manufacturing facilities worldwide and U.S. HQ in Fremont, CA. Our company mission is “To provide innovative, clean and energy-efficient solutions for a better tomorrow” supported by a product portfolio that features a range of energy efficiency solutions including ventilation fans, wind energy systems, solar panels, LED lighting and EV chargers. Delta’s operations are ISO-9001, ISO-14001, ISO-14064, OHSAS-18001 and TS-16949 certified. Delta DC brushless fans are used in applications where precision is paramount. This includes consumer products such as HP laptops, IBM servers, Dell desktops, Apple MacBook Air and Microsoft XBox Kinect.
Please visit our global website www.deltaww.com for a more comprehensive look at Delta operations, products and company profile.
1. All Delta Breez Ventilation fans are manufactured with DC Brushless Motor Technology
2. All Delta Breez Ventilation fans are Energy Star certified
3. All Delta Breez Ventilation fans have soft start and lock protection functions
4. All Delta Breez Ventilation fans are engineered to run continously for 70,000 hours, or 8 years.
CFM and Sone are how bath fans are generally compared.
CFM (Cubic Feet per Minute) is ‘air flow’ – the amount of air extracted per minute when the fan is running. The amount of CFM needed is generally related to the size of the area exhausted – please see ‘Sizing the right fan’ below.
Sone level is how loud the fan is to the human ear. Doubling the sone value means double the noise. The average 80 CFM bath fan runs at 3~4 sones. Delta Breez fans run as low as <0.3 sones. At less than 0.3 sones, the fan is virtually silent. This is the lowest noise rating of any exhaust fan on the market.
Because energy efficiency and performance are at the core of all Delta products, Delta Breez fans produce industry leading CFM per watt ratios and sone ratings. To qualify for the Energy Star label, an 80 CFM ventilation fan must produce 1.4 CFMs per watt. Delta’s 80 CFM VFB25AC produces 11.27 CFM per watt, which is 8 times better than the Energy Star requirement today. Energy Star also requires a ventilation fan to be at 2.0 sones or less. Our BreezSlim 50 CFM fan runs at 1.0 sone and our BreezSignature 80 CFM fan runs at <0.3 sones.
Bathroom Ventilation
The following are guidelines for ventilating both large and smaller bathrooms using intermittent or continuous ventilation.
Small rooms:
For bathrooms up to 100 square feet in area, HVI recommends that an exhaust fan provide 1 CFM per square foot (approximately eight air changes per hour)
to properly ventilate the bathroom.
Example:
Bathroom is 8'x5' (with 8' ceilings). Multiply 8 x 5 = 40ft.
Bathroom area is 40ft.
At 1 cfm per square foot the minimum recommendation is a fan rated at 40 cfm.
Larger rooms:
For bathrooms above 100 square feet in area, HVI recommends a ventilation rate based on the number and type of fixtures present, according to the following table:
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Toilet
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50 CFM
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Shower
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50 CFM
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Bath Tub
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50 CFM
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Jetted Tub
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100 CFM
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Note: Enclosed toilet rooms must have an operable window or a fan for ventilation.
Example:
The bathroom is 20'x12'. There is a tub (without jets), a shower enclosure and an enclosed toilet.
Each fixture requires 50 cfm:
Tub 50 cfm
Shower 50 cfm
Toilet 50 cfm
Total 150 cfm
No. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) recommend exhausting through the roof only.
Humidity Sensor fans have two modes: Humidity Sensing Mode and Always On Mode. Flipping the wall switch toggles the fan back and forth between modes. LED light indicator underneath the fan grill shows the user which mode the fan is in. Blue light means the fan is in Humidity Sensing Mode. Amber light means the fan is in Always On Mode.
In Always On Mode, the fan runs continuously at full speed. In Humidity Sensing Mode, the fan will only come on when the fan senses a humidity level of 60% RH (Relative Humidity) or above. The fan speed automatically adjusts according to the humidity level. On very rare occasions (about 1% of the time), our fan may still run even though the homeowner feels or detects the house humidity level is lower than 60% RH. The possible reasons are:
1. Our sensor tolerance at +/-5%
2. Outdoor humidity back draft to the fan
3. Indoor temperature level
Manufacturer recommended actions:
1. Let the fan run since it is good to keep venting the house and the electric bill is minimal (approximately less than $10 per year)
2. Shut the fan switch when not in use
The Delta Breez humidity sensing fans work normally in summer months, even with the air conditioner turned on, when temperatures reach 76.9F to 103.9F. Due to the characteristics of the humidity sensor, in the cooler winter months when the temperatures are between 35F – 60F, it will become more sensitive. Some customers may experience the fan continuously running even when humidity level is lower than 60%, this usually only happens during the winter time.
Delta is always willing to exchange or credit humidity sensing fans that customers are not happy with.
Yes, the Delta BreezSlim has been UL certified to install in a side wall.
DC brushless motor exhaust fans use as much as 76% less power than AC motor exhaust fans, and DC brushless motors are a lot quieter and have longer lasting bearings with soft start function. A DC brushless motor can run continuously for 70,000 hours (approximately 8 years). DC brushless motor technology allows Delta Breez fans to achieve extremely low noise levels.
DC brushless motor fans install just like AC motor fans. No special wiring is needed. A transformer built into the fan automatically switches the power supply from AC to DC.
When the fan is powered on the motor will control the speed from low to high in a few seconds unlike an AC Motor which jumpstarts the fan. This process increases the motor bearings life.
With this unique function the Delta Breez Ventilation fans will automatically power off when the impeller is locked abnormally. For example when a buildup of dirt and dust accumulates on the fan over its lifespan. The fan will repeatedly turn itself on every 10 seconds until the impendence is removed.
All Delta BreezSlim and BreezGreenBuilder series exhaust fans have ‘project pack’ separate units for the housing, fan motor and grille, allowing the fan motor to be installed after the housing is installed – such as in new construction. This also allows the fan motor to be replaced at any time while keeping the same housing. The precision engineering and DC brushless motor construction of Delta Breez fans makes having to replace the fan motor an unusual circumstance.
No. For proper performance, it is recommended that Delta Breez Ventilation Fans only be used with Delta Breez components.
The Delta Breez Ventilation Fan Warranty is 3-Year limited warranty. Please refer to the Warranty tab of this binder.
BreezSignature:
The main light bulb in the VFB25ACL and VFB25ADL is a 26W CFL with GU24 base (pin style). The night-light in the VFB25ACL and VFB25ADL is a 4W incandescent light bulb with E12 screw base. Both lights are included in the box with the fan. Replacement light bulbs can also be purchased at most major home improvement retailers or through your local contractor or supplier.
BreezSignatureLED:
The main light and night-light in the VFB080D4LED1 are contained in one LED Light Module. The LED Light Module is installed in the grille. The LED Light module is replaceable.
BreezGreenBuilder:
The main light blub in the VFB050C4L1 and VFB080C4L1 is a 26 W CFL with GU24 base (pin style). The light is included in the box with the fan. Replacement light bulbs can also be purchased at most major home improvement retailers or through your local contractor or supplier.
Yes. All of the Delta Breez Ventilation Fans are UL approved to be installed over a tub or shower, it must be marked as appropriate for the application and be connected to a GFCI (Ground Fault Circuit Interrupter) – protected branch circuit.
• Can I use a timer with the Delta Breez Ventilation System Fans
Timers may be used on certain Breez Ventilation System Fans
A timer can be used on the following models:
BreezSignature: VFB25AC, VFB25AD
BreezSlim: VFB050B3A1, VFB070B3A1
Timers cannot be used on the following models:
BreezSignature: VFB25AX, VFB25ACH, VFB25ADH, VFB25AEH
BreezSlim: VFB070B3X1
No. Delta does not manufacture switches or timers but these components are readily available in most major home improvement retailers or through your local contractor or supplier.