Installation Instructions
Follow the guidelines for proper duct sizing in the ducting charts.
DUCTING CHART–JV5 Series Models
Equivalent Length in Feet
| 0 | 25 | 50 | 75 | 100 | 125 | 150 |
| 250 | • |
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in CFM |
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200 | • | • |
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• | • | 7″ Round |
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Volume |
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150 |
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| 31⁄4″ x 10″ | • | • | • | |
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Air |
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| Rectangular |
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100 |
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| 31⁄4″ x 10″ Rectangular Transition to 6″ Round = 4.5 ft. |
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| 7″ Round 90° Elbow = 8 ft. |
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| 7″ Roof Cap = 30 ft. |
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DUCTING |
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| Equivalent Length in Feet |
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| 0 | 25 | 50 | 75 | 100 | 125 | 150 |
| 400 |
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| 350 |
| • | • |
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CFM |
| • | • | 7″ Round |
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in | 300 |
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Volume |
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250 |
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Air |
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| • | ||
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| 31⁄4″ x 10″ | ||
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| 200 |
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| Rectangular |
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| 31⁄4″ x 10″ Rectangular Transition to 6″ Round = 4.5 ft. |
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| 7″ Round 90° Elbow = 8 ft. |
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| 7″ Roof Cap = 30 ft. |
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MAXIMUM DUCT LENGTH: For satisfactory air movement, the total duct length of a 31⁄4″ x 10″ rectangular,
6″ or 7″ diameter round duct should not exceed 65 equivalent feet.
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