INSTALLATION2
MOUNTING HEIGHTS
6" |
Min |
96" |
36" |
DUCTING |
A minimum of 6” round or
Always use
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 high- er 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 lose performance and efficiency.
If available, also refer to range manufacturer's height clearance requirements and recom- mended hood mounting height above range.
*Minimum clearance of 24” hood above range height.
**Maximum clearance 32" hood above range height.
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” |
|
|
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 45 elbow used:
=30' + 30' + 9' =69' used, 31' available for straight duct runs.
