CERTIFIED TEST DATA
The air delivery of a ventilating system may be determined by:
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: 31⁄4" x 10" duct equals 6 inch diameter duct.)
AIR PERFORMANCE CURVE
(4 In. Duct to 10 Foot Lengths)
| 0.50 |
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| 50 Feet |
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OF WATER | 0.40 |
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| 40 Feet |
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0.30 |
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| 30 Feet | |
0.20 |
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| 20 Feet | |
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STATIC | 0.10 |
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| 10 Feet |
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| 0.00 | 25 |
| 50 |
| 75 |
| 100 |
| 125 |
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| 0 |
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| CFM CUBIC FEET PER MINUTE |
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STATIC PRESSURE |
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INCHES OF WATER | 0.05 | 0.1 | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | ||
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| CFM | 77 | 75 | 72 | 70 | 67 | 64 | 60 | 54 | 47 |
TYPICAL INSTALLATION | |
LIGHT | REFLECTOR |
SOCKET | MOUNTING |
| SCREW |
Product specifications subject to change without notice.
NuTone, Inc., 4820 Red Bank Road, Cincinnati, Ohio 45227
Printed in U.S.A.