Nutone QTXEN User Manual download pdf (Page 7)

Easy steps for choosing and sizing

the right ventilation fan for your home.

6" ducting overcomes most

performance-related installation issues.

NuTone’s QTX Series fans deliver high performance in virtually any real-world installation. They are engineered with a 6"

duct connector for peak air movement and extremely quiet operation, even when the duct run is not short and straight.

NuTone Ventilation Fans

—

Sizing Guide

Determine which rooms could use

ventilation, and how much is needed.

Spot ventilation is used in localized

areas to remove moisture, odor and

airborne pollutants quickly. Most

commonly used in the bath or

powder room, spot ventilation can

also be used in a laundry room,

exercise area, closet, or bedroom,

wherever air should be changed

frequently. Decorative and recessed

models can be ideal solutions for

these situations. According to the

Home Ventilating Institute, Air

Changes per Hour (ACH) for

comfortable and healthy living

should be as follows: Bathrooms:

8 changes, Kitchens: 15 changes,

Living/bedrooms: 6 changes. NuTone

bath fans, utility fans and high

capacity fans meet these needs.

Calculate the air movement

necessary for proper ventilation.

Air movement is measured in

Cubic Feet per Minute (CFM). To

determine CFM requirements, first

determine the size of your room.

Measure and multiply the length,

width and ceiling height of your

room to determine cubic footage.

Then use the multiplication factor of

.13 and round up to the next “ten.”

See the three examples that follow.

Example 1: Bathroom with 8' ceiling:

7' wide x 9' long x 8' high x .13 = 66.

Select a bath fan with at least

70 CFM.

Example 2: Bathroom with 9' ceiling:

10' wide x 9' long x 9' high x .13 =

105. Select a bath fan with at least

110 CFM.

Example 3: For a bathroom with a

vaulted ceiling, use the average ceiling

height at the wall and the peak:

8' wide x 12' long x ((8' at wall +

12' at peak) / 2 = 10') average height

x .13 = 125. Select a fan(s) with at

least 130 CFM.

Account for long duct runs

and ductwork that turns before it

reaches the exterior vent.

When airflow is restricted in any

way it slows down. Just as a car

must slow down for a sharp corner,

air decelerates when going through a

turn in a duct run. Whenever

possible, create a straight duct run

with large radius turns, if they’re

necessary at all. Rigid ductwork is

optimal because airflow restriction is

minimized. Flexible tubing may be

convenient to install, but resistance

is created as air is moved over the

spiral metal frame of the tubing.

With long duct runs or ducts with

multiple turns the fan works harder,

noise increases and fan performance

(CFM) is compromised. Select a fan

model with an even greater CFM

ratio to compensate.

Performance

A good ventilation fan is the product

of research, testing and listening to the

needs of consumers. At NuTone we build

these desires into ventilation products

that provide the best mix of power,

sound and quality for every budget.

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