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Clearance (continued)
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 w/ 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
Tools Required
Check
Tools
Box
Tape
measure
Certified
duct tape
Utility knife
Pencil
Level
Safety
goggles
Screwdriver
DUCT SIZE
A minimum of 6" round duct must be used to maintain maxi-
100FT
mum airflow efficiency.
Flexible ducts are provided for convenience, always use rigid
15FT
type metal ducts if available to maximizing airflow.
9FT
1FT
Also use calculation (on left) to compute total available duct
run when using elbows, transitions and caps.
5FT
ALWAYS, when possible, reduce the number or transitions
and turns. If required a long duct increase duct size from 6"
to 7 or 8".
30FT
30FT
If a reducer is used, install a long reducer instead of pan-
cake 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.
Check
Tools
Box
Wire Nut
Wire cutter &
pliers
Adjustable
wrench
Drill
1/8" &
3/8" bits
Hammer
Safety gloves
Saber Saw
8
Check
Tools
Box
20 Amp Wire
With ground
(120v 60Hz)
10" duct.
Length to suit
The Installation.
Keyhole
Saw
Metal Snips
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