INSTALLATION2
MOUNTING HEIGHTS
10" |
Min |
96" |
36" |
DUCTING |
A minimum of 6" round or
Always use rigid type metal ducts only.
Flexible ducts could restrict air flow by up to 50%.
Also use calculation (on right) to compute total available duct run when using elbows, transitions and caps.
ALWAYS, when possible, reduce the number of transitions and turns. If long duct run is required, increase duct size from 6" to 7” or 8". If a reducer is used, install a long reducer instead of a pancake reducer. Reduce duct size as far away from open- ing as possible.
If turns or transitions are required:
Install as far away from opening and as far apart, between 2, as possible.
Minimum mounting height between range top to hood bottom should be no less than 24".
Maximum mounting height should be no higher than 32".
It is important to install the hood at the proper mounting height. Hoods mounted too low could result in heat damage and fire hazard; while hoods mounted too high will be hard to reach and will loose performance and efficiency.
If available, also refer to range manufacturer's height clearance requirements and recom- mended hood mounting height above range.
Minimum Duct Size:
Round:
6" minimum Rectangular:
Duct Run Calculation:
Maximum run
6" or | 100 | FT |
Deduct: |
|
|
each 90 Elbow used | 15 | FT |
each 45 elbow used | 9 | FT |
each 6" to 3/14 x 10" |
|
|
transition used | 1 | FT |
each 3/14 x 10" to 6" |
|
|
transition used | 5 | FT |
Side Wall Cap w/ damper | 30 | FT |
Roof Cap | 30 | FT |
|
|
|
e.g.- 1 roof cap, 2x90 elbows, 1 x 45 elbow used:
=30' + 30' + 9' =69' used, 31' available for straight duct runs.
