- What is a Sone?
- What is CFM?
- What is Static Pressure?
- What is Makeup air?
- How do I know what size fan to use?
- Can a 3" duct pipe be used on a bath fan with a 4" duct connector?
- Can a 4" duct pipe be used on a bath fan with a 3" duct connector?
- Why are Panasonic fans so quiet?
- What makes Panasonic fans so energy efficient?
- Why does Panasonic fans have such a long life?
- Can insulation material be used over fans installed in the ceiling?
- Can a Panasonic fan be used over a bathtub or shower?
- What are the advantages of an in-line ventilating fan?
- Can a Panasonic fan be installed in a wall as well as in the ceiling?
- Can a Panasonic fan be used above a kitchen range?
- Can I exhaust my fan into the attic instead of through the roof?
- If water is dripping from the grille, or the mirrors are not clearing
quick enough, is my fan not operating correctly?
What is a Sone?
A sone is an internationally recognized measurement of sound output. Sones translate
decibel readings into numbers that correspond to the way people sense volume, and
follow a "linear" scale, like inches (see chart below). Sone readings
offer quick sound comparisons for laymen and engineers.
Sound level situation
How we feel
Conversation with added noise
Night in suburbs
Comfortable zone free from noise
2. What is CFM?
Cubic feet per minute a measure of volume flow rate, or air moving capability
of an air moving device.
3. What is static pressure?
A measure of the resistance a fan must overcome before it can move or exhaust air.
For more information, visit the Home Ventilation Institute website at
4. What is Makeup air?
Replacement air for the air exhausted out of the structure by mechanical ventilation.
5. How do I select the right fan for a specific room size?
To calculate how many CFM of airflow is required to properly ventilate any room
in your home, use the following calculation.
- For an 8 foot ceiling take the square footage of the room and multiply it by 1.1.
(Example 10' x 10' room with 8' ceilings: 10' x 10' = 100 square feet x 1.1
= 110 CFMs)
- For any ceiling over 8 feet, take the height of the ceiling and multiply by .1375.
Take this figure and multiply by the square footage of the room. This will equal
the recommended CFMs. (Example 10' x 12' room with 9' ceilings: 9' x .1375
=1.24 x 120 square feet = 149 CFMs.)
- Both calculations will give you the minimum recommended CFM.
6. Can a 3" duct pipe be used on a bath fan with a 4"
Avoid using a 3" duct as this creates very high static pressure, reduces airflow
dramatically, and over the long term, reduces motor life in the fan. If you are
remodelling a house with existing 3" duct runs, one trick is to use the 3"
as a guide for the 4" replacement duct. Simply slip the new 4" duct over
the 3" and push it to the fan or to the wall to avoid having to expose the
entire duct. Once the new duct is in place, pull out the 3" and dispose of
7. Can a 4" duct pipe be used on a bath fan with a 3"
Yes, however a 3" to 4" adapter is required.
8. Why are Panasonic fans so quiet?
- Fan noise is created as air passes through the grille and enters the blower wheel
assembly or fan blade as much of the noise is a function of the blower wheel.
- Panasonic fans use a large diameter, wide blower wheel that moves a large amount
of air at reduced RPMs. The blower wheel is approximately 60% larger than the competition's,
but turns at a lower RPM, reducing tip speed and therefore noise.
- The double suction blower wheel is designed to draw in air from both sides of the
wheel as this helps keep the noise down and there is more area for the air to enter
- The exhaust outlet is as wide as the blower wheel, allowing less turbulent airflow
as it enters the duct. It is then gradually stepped down before it enters the duct.
- Panasonic fans use a four-pole condenser motor which helps the fan to rotate smoothly
and evenly, reducing noise.
9. What makes Panasonic fans so energy efficient?
In terms of input wattage, Panasonic fans are among the lowest in the industry.
This low wattage draw is accomplished in a number of ways, including:
- Unique motor design
The fan condenser acts like a capacitor to store electrical energy and deliver it
quickly and in exact amounts to the coil. This reduces the power draw, thus improving
the electrical efficiency of the motor.
- Selective application
Panasonic builds its own fan motors and components, thereby optimizing efficiency
by matching the exact motor characteristics with the desired performance of the
- Wide blower wheel
The wide blower wheel improves airflow efficiency, enabling the fan to operate at
lower RPM and reduce energy usage.
10. Why do Panasonic fans have such a long life?
Panasonic fans are designed to provide continuous operation for a minimum of 30,000
hours. They are actually designed to provide up to 100,000 hours of operation, but
most fans have not been around long enough to reach that goal in testing. Some fans,
however, have reached 60,000 hours in testing with virtually no wear on their components.
- The following features enable the longevity of Panasonic fans:
- Motor production
Panasonic motor production is fully automated, with an automatic defect detecting
system and have a defect rate of less than 0.0006%.
- ISO 9001 plant
The production facilities that build Panasonic fans have been recognized by the
International Standards Organization (ISO) as being among the highest quality factories
in the world.
- Motor design
The electrical design of the fan motor allows it to operate at lower temperatures
than most other motors, increasing the life of the motor and its bearings.
- Fan housing
The fan housing is made of heavy gauge zinc galvanized steel, and painted to protect
it from rust.
11. Can insulation material be used over fans installed in
Yes. Loose fill or batt insulation can be placed directly over the fan housing in
the attic. The efficient, cool-running motors and fluorescent bulbs in Panasonic's
fans do not create enough ambient heat to prevent using insulation.
12. Can a Panasonic fan be used over a bathtub or shower?
Yes, provided it is protected by a Ground Fault Circuit Interrupter (GFCI). Keep
in mind, however, that any ventilation device located in a damp environment may
have a reduced life due to high humidity and the potential for corrosion. Fans
used in high-humidity areas should be operated for longer periods of time to ensure
the removal of moisture and to reduce the potential for condensation in the fan
body or ducting.
13. What are the advantages of an in-line ventilating fan?
The Panasonic In-Line fan is a versatile system that you can use to provide multiple
ventilation inlets in a large bathroom (e.g. shower, toilet, and vanity). Use it
as a continuous (low rate) ventilation system with multiple inlets throughout the
home to improve indoor air quality. Or, use it to ventilate two bathrooms at once.
14. Can a Panasonic fan be installed in a wall as well as in
Only WhisperWall models are specifically designed to be installed in
Smaller ceiling fans (up to 110 cfm) should not be installed in the wall due to
mechanical concerns (motor orientation, bearing lubrication, built-in damper, etc.).
However, if they are installed in the wall, the duct needs to be pointed up to allow
the damper to operate, but the bearings may not last as long as specified due to
insufficient oil flow within the sleeve bearings.
Larger fans (190 and 340 cfm) can be installed in either the ceiling or wall. These
fans are not prone to lubrication concerns; however, the depth of the wall cavity
versus the fan height of the housing should be considered.
15. Can a Panasonic fan be used above a kitchen range?
No. Fans installed above kitchen ranges must be listed for that application by UL,
and must be designed to handle grease and high temperatures. Panasonic
fans should only be used to provide auxiliary kitchen ventilation. An alternate
approach is to use a ducted range hood or downdraft exhaust, and a Panasonic ventilation
fan to exhaust the general odours and moisture in the kitchen.
16. Can I exhaust my fan into the attic instead of through
You should never exhaust into the attic space. Moisture could damage the building
17. If water is dripping from the grille, or the mirrors are
not clearing quickly enough, is my fan not operating correctly?
If this is happening, it might be caused by a faulty roof jack allowing rain to
come into the duct, or condensation from warm, humid air in the house striking the
cold duct surface.
If your fan has a problem with condensation, two things may help. First, try operating
the fan for longer periods of time to carry out more of the moisture, so the air
is not humid when the fan stops running. Moisture will generally not form when the
fan is running unless it is very cold, or the installation has a very long duct
run in a cold attic. Second, you can insulate the duct to reduce the probability
Also, if the fan does not appear to be clearing moisture from the room, check the
ducting and run time of the fan. Poor duct design, installation, or damage may prevent
the fan from overcoming the static pressure of the duct, which means that it will
not be able to get the air and therefore the moisture out.
Be sure to contact your local electrical and building officials to ensure local
building and electrical codes are met before attempting to install ventilation fans
in your home.