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Ductwork
NEVER exhaust air or terminate duct work into spaces between walls, crawl spaces, ceiling, attics or garages.
All exhaust must be ducted to the outside.
Use metal ductwork only.
Fasten all connections with sheet metal screws and tape all joints with certified Silver Tape or Duct
Tape.
Duct Run Calculation:
Maximum run 6" or 3-1/4 x 10" duct
Deduct:
each 90 Elbow used
each 45 Elbow used
each 6" to 3/14 x 10"
transition used
each 3/14 x 10" to 6"
transition used
Side Wall Cap w/ damper
Roof Cap
e.g. – 1 roof cap, 2x90 elbows, 1x45 elbow
= 30' + 30' + 9'=69' used,
31' available for straight duct runs
100FT
DUCT SIZE
A minimum 6" round duct must be used to maintain
maximum airflow efficiency.
15FT
Flexible ducts are provided for convenience, always
use rigid type metal ducts if available to maximizing
9FT
airflow.
1FT
Also use calculation (on left) to determine total
available duct run when using elbows, transitions
and caps.
5FT
ALWAYS, when possible, reduce the number of
transitions and turns. If a long duct is required,
increase duct size from 6" to 7 or 8".
30FT
If a reducer is used, install a long reducer instead of
30FT
pancake reducer. Reduce duct size as far away
from the opening as possible.
If turns or transitions are required: Install as far away
from opening and as far apart, between 2, as
possible.
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