NuTone 668RP Certified Test Data, Air delivery of a ventilating system may be determined by

CERTIFIED TEST DATA

HVI-2100 CERTIFIED RATINGS comply with new testing technologies and procedures prescribed by the Home Ventilating Institute, for off-the-shelf products, as they are available to consumers. Product performance is rated at 0.1 in. static pressure, based on tests conducted in AMCA's state-of-the-art test laboratory. Sones are a measure of humanly-perceived loudness, based on laboratory measurements. This NuTone model is listed by Underwriters' Laboratories Inc.

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										50 Feet
OF WATER	0.40										40 Feet
PRESSURE–INCHES	0.30										30 Feet
	0.20										20 Feet
STATIC	0.10										10 Feet
	0.00	25		50		75		100		125
	0
		CFM CUBIC FEET PER MINUTE
STATIC PRESSURE
INCHES OF WATER			0.05	0.1	0.15	0.2	0.25	0.3	0.35	0.4	0.45
		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.