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DUCTING CHART:
Flow vs. equivalent feet of duct length
020406080100
Equivalent Feet of Duct Length
300
250
200
150
100
50
0
CFM
Follow the guidelines for proper duct sizing in the ducting charts.
Installation Instructions
MAXIMUM DUCT LENGTH: For satisfactory air movement, the total duct length of a 3
1
⁄4″ x 10″ rectangular,
6″ or 7″ diameter round duct should not exceed 65 equivalent feet.
JV347
JV338