American Dryer Corp. D20 - Manual (Page 15)

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E. EXHAUST REQUIREMENTS
DO NOT use a nonmetal flexible vent or a metal vent that is smaller than 4” (10.2 cm) in diameter or exhaust
hoods with magnetic latches.
DO NOT exhaust dryer into a chimney, furnace, cold air vent, attic, crawl space, or any other vent used for
venting.
DO NOT install flexible vent in enclosed walls, ceilings, or floors.
IMPORTANT: Observe ALL governing codes and ordinances.
Exhaust your dryer to the outside. Moisture and lint indoors may cause:
1. Lint to gather around the dryer where it can be fuel for a fire.
2. Moisture damage to woodwork, furniture, paint, wallpaper, carpet, etc...
3. Housecleaning problems and health problems.
A 4” (10.2 cm) diameter vent is required. A rigid or flexible metal vent must be used. DO NOT use a plastic
or a foil covered vent.
Use a heavy metal vent. DO NOT use a plastic or metal foil vent. A rigid metal vent is recommended to
prevent crushing and kinking. A flexible metal vent must be fully extended and supported when the dryer is in
its final position. Remove excess flexible vent to avoid sagging and kinking that may result in reduced airflow.
If using an existing exhaust system, clean lint from entire length of system and make exhaust hood is not plugged
with lint. Replace any vinyl or metallized plastic foil vent with rigid metal or flexible metal vent.
Use duct tape to seal ALL joints. DO NOT use screws or other fastening devices that extend into the interior
of the vent to secure vent.
Service check: Back pressure in any exhaust system used must not exceed 0.6 inches (1.49 mb) water column
(W.C.) measured with an incline manometer at the point that exhaust vent connects to the dryer.