Zephyr CACHE CCA-E36ASX Use, Care And Installation Manual page 8

Min 24"-Max 32"
36"
96"
Minimum mount height between range top and
hood bottom should be no less than 24".
Maximum mount 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
lose its performance and efficiency.
If available, also refer to range manufacturer's
height clearance requirements and recommended
hood mounting height above range.
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DUCTING
A minimum of 6" round or 3-1/4" x 10" rectangular
duct work must be used to maintain maximum air
flow efficiency with the 600 cfm internal blower.
A minimum of 10" to 8" round duct work must be
used with the 1000 cfm external blower.
Always use rigid type metal ducts only. Flexible
ducts could restrict air flow by up to 50%.
Use calculation (on page 5) to compute total
available duct run when using elbows, transitions
and caps.
ALWAYS, when possible, reduce the number or
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
opening as possible.
If turns or transitions are required; install as far
away from opening and as far apart, between 2,
as possible.