Installation Instructions
DUCT FITTINGS
Use this chart to compute maximum permissable lengths for duct runs to outdoors.
Note: Do not exceed maximum permissable equivalent lengths!
Maximum duct length: 100 foot for vent hoods.
Flexible ducting:
If flexible metal ducting is used, all the equivalent feet values in the table should be doubled. The flexible metal duct should be straight and smooth and extended as much as possible.
Do NOT use flexible ducting.
Note: Any home ventilation system, such as a ventilation hood, may interrupt the proper flow of combustion air and exhaust required by fireplaces, gas furnaces, gas water heaters and other naturally vented systems. To minimize the chance of interruption of such naturally vented systems, follow the heating equipment manufacturer’s guidelines and safety standards such as those published by NFPA and ASHRAE.
This Hood Must Use 7” Round
Duct. It Can Transition To
3¼” x 12” Duct
Kit - JXDW1
Order kit JXDW1 if your
installation requires horizontal ducting from the top of the hood through the backwall and:
•You have an 8 ft. ceiling and need to use a JXCH Series Chimney Cover, or
•You have a 12” cabinet or 12” soffit that the hood is to be mounted beneath.
This kit provides a duct transition
from 7” round to 3¼” x 10”
rectangular for
venting.
Using a smaller diameter duct size will reduce performance
1 Ft = 0.3 m 1” = 2.5 cm
|
|
| Total |
| Equivalent | Quantity | Equivalent |
Duct Piece Dimensions | Length* | Used | Length |
| 1 ft. |
|
|
Round, | (per foot |
|
|
straight | length |
|
|
| 1 ft. |
|
|
3¼” x 12” | (per foot |
|
|
straight | length |
|
|
90° elbow | 8 ft. |
|
|
45° elbow | 6 ft. |
|
|
3¼” x 12” or | 15 ft. |
|
|
90° elbow |
|
| |
3¼” x 12” or | 9 ft. |
|
|
45° elbow |
|
| |
3¼” x 12” or | 20 ft. |
|
|
90° flat elbow |
|
| |
7” round to |
|
|
|
3¼” x 12” | 1 ft. |
|
|
transition |
|
| |
3¼” x 12” to 7” round | 5 ft. |
|
|
transition |
|
| |
7” round to |
|
|
|
3¼” x 12” | 5 ft. |
|
|
transition 90° elbow |
|
| |
3¼” x 12” to7” round | 15 ft. |
|
|
transition 90° elbow |
|
| |
Round |
|
|
|
wall cap | 30 ft. |
|
|
with damper |
|
| |
3¼” x 12” |
|
|
|
wall cap with | 30 ft. |
|
|
damper |
|
| |
7” round | 30 ft. |
|
|
roof cap |
|
| |
Round | 24 ft. |
|
|
roof vent |
|
| |
*Actual length of straight duct plus duct fitting |
|
| |
equivalent. Equivalent length of duct pieces are |
|
| |
based on actual tests conducted by GE Evaluation |
|
| |
Engineering and reflect requirements for good |
|
| |
venting performance with any ventilation hood. | Total Duct Run |
| |
10
