Manual

the dryer(s) should be planned and constructed so that no air restrictions occur. Any restriction

due to pipe size or type of installation can cause slow drying time, excessive heat, and lint in the

room.

From an operational standpoint, incorrect or inadequate exhausting can cause a cycling of the

high limit thermostat, which shuts off the main burners and results in inefficient drying.

The oval exhaust duct connection near the top of the dryer will accept a compressed 8” round

duct. Individual exhausting of the dryers is recommended. A pipe of the proper diameter should

be attached to the dryer adapter collar and extended out through an outside wall to exhaust all

heat, moisture, and lint outside. This pipe must be very smooth on the inside, as rough surfaces

tend to collect lint, which will eventually clog the duct and prevent the dryer from exhausting

properly. All elbows must be smooth on the inside. All joints must be made so the exhaust end

of one pipe is inside the next one downstream. The addition of an exhaust pipe tends to reduce

the amount of air the blower can exhaust. This does not affect the dryer operation if held within

practical limits. For the most efficient operation, it is recommended that no more than 14 ft

[4.27m] of straight 8” diameter pipe with two right angle elbows is used for each cylinder.

When more than two elbows are used, two feet of straight pipe should be removed for each

additional elbow. No more than four right angle elbows should be used to exhaust a dryer.

Maintain minimum 1" [25] clearance between duct and combustible material.

If the exhaust pipe passes through a wall, a metal sleeve of slightly larger diameter should be

set in the wall and the exhaust pipe passed through this sleeve. This practice is required by some

local codes and is recommended in all cases to protect the wall. This type of installation should

have a means provided to prevent rain and high winds from entering the exhaust when the dryer

is not in use. A hood with a hinged damper can be used for this purpose. Another method would

be to point the outlet end of the pipe downward to prevent entrance of wind and rain. In either

case, the outlet should be kept clear, by at least 24" [610], of any objects that would cause an air

restriction.

Never install a protective screen over the exhaust outlet.

When exhausting a dryer straight up through a roof, the overall length of the duct has the

same limits as exhausting through a wall. A rain cap must be placed on top of the exhaust and

must be of such a type as to be free from clogging. The type using a cone shaped “roof” over the

pipe is suitable for this application.

Exhausting the dryer into a chimney or under a building is not permitted under any

conditions. In both cases, there is a danger of lint build-up, which can be highly combustible.