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1. Determine the equivalent duct length for each 90
degree elbow by adding one foot of duct length for
each inch of duct diameter, i.e., a 4 inch diameter duct
elbow equals 4 feet equivalent duct length and an
8 inch diameter duct elbow equals 8 feet equivalent
duct length.
2. Add the total straight length of duct and the equivalent
length for each elbow to obtain the total equivalent
duct length.
3. Locate the intersection of the fan performance curve
and the total equivalent duct length curves and draw a
vertical line down to the CFM scale and read the system
air performance.
(NOTE: 3
1
⁄
4
" x 10" duct equals 6 inch diameter duct.)
250
0
0.00
0.10
0.20
0.30
0.40
0.50
STATIC PRESSURE–INCHES OF WATER
50 Feet
40 Feet
30 Feet
20 Feet
10 Feet
CFM CUBIC FEET PER MINUTE
100075050 0 1250
250
0
0.00
0.10
0.20
0.30
0.40
0.50
STATIC PRESSURE–INCHES OF WATER
50 Feet
40 Feet
30 Feet
20 Feet
10 Feet
CFM CUBIC FEET PER MINUTE
100075050 0 1250
AIR PERFORMANCE CURVE – Horizontal
(12 In. (6 x 19) Duct to 10 Foot Lengths)
AIR PERFORMANCE CURVE – Vertical
(12 In. (6 x 19) Duct to 10 Foot Lengths)
STATIC PRESSURE
INCHES OF WATER
CFM
0.05
775 735 686 640 575 400 – – –
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
STATIC PRESSURE
INCHES OF WATER
CFM
0.05
770 727 675 600 475 275 125 – –
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
18
15
⁄
16
"
DAMPER
SECTION
15
7
⁄
16
"
HOUSING
21
11
⁄
16
"
7"
MOUNTING
BRACKET
14
7
⁄
16
"
5
7
⁄
8
"
MOTOR
ASSEMBLY
GRILLE
MOUNTING
SCREWS (4)
DIMENSIONS
The air delivery of a ventilating system may be determined by:
Product specifications subject to change without notice.
NuTone, Inc., 4820 Red Bank Road, Cincinnati, Ohio 45227
Broan-NuTone Canada, Inc., 1140 Tristar Drive, Mississauga, Ontario, Canada L5T 1H9
Printed in U.S.A.