Exhaust and Venting

DRYER AIR FLOW

Nothing is more important than air flow for the proper operation of a

INSTALLATION

clothes

dryer. A dryer is a pump which draws make-up air from the

 

out-of-doors, through the heater, through the clothes and then forces

 

the air through the exhaust duct back to the out-of-doors. Just as in a

 

fluid water pump, there must be a fluid air flow to the inlet of the

 

dryer, if there is to be the proper fluid air flow out of the exhaust

 

duct.

 

 

 

 

In summary, there must be the proper size out-of-doors inlet air

 

opening (4-6 times the combined areas of the air outlet) and an

 

exhaust duct, size and length of which allows flow through the dryer

 

with

no more

than 0.3 inches water column (.8 mbar) static pressure

 

in

the

exhaust

duct.

 

In some instances, special fans are required to supply make-up air,

 

and/or boost exhaust fans are required for both regular and energy

 

saving

models.

EXHAUST

FOR BEST DRYING:

DUCT

 

1.

Exhaust duct maximum length 14 feet (5 mm) of straight

 

 

 

 

duct and maximum of two 90° bends.

 

 

2

.

Use 45° and 30° elbows wherever possible.

 

 

3

.

Exhaust each dryer separately.

 

 

4

.

Use 2

feet (0.7 m) of straight duct on dryer before installing

 

 

 

 

an elbow on energy-saver models only.

 

 

5

.

Do not install wire mesh or other restrictions in the exhaust

 

 

 

 

duct.

 

 

 

6

.

Use clean-outs in the exhaust duct and clean periodically

 

 

 

 

when needed.

 

 

7

.

Never exceed 0.3 inches water column (8 mbar) static

 

 

 

 

pressure in the exhaust duct.

MAKE-UP AIR

 

8

.

Inside surface of the duct must be smooth.

 

9.

Recommend pop rivets for duct assembly.

 

FOR BEST DRYING:

 

 

1

.

Provide opening to the out-of-doors in accordance with the

 

 

 

 

following:

 

 

 

 

For each dryer—

 

 

 

 

6 inches (2 m) diameter exhaust requires a 1 square feet

 

 

 

 

(0.1 m²) opening for make-up air.

 

 

 

 

8 inches (3 mm) diameter exhaust requires a 2 square feet

 

 

 

 

(0.2 m²)opening for make-up air.

 

 

 

 

12 inches (4 mm) diameter exhaust requires a 4 square feet

 

 

 

 

(0.4 m²)opening for make-up air.

 

 

2

.

Use barometric shutters in the inlet air opening to control air

 

 

 

 

when dryers are not running.

OTHER

Other

Recommendations

RECOMMENDATIONS

To assure compliance, consult local building code requirements.

TROUBLESHOOTING

Troubleshooting

 

Hot dryer surfaces, scorched clothes, slow drying, lint accumulations,

 

or

air

switch malfunction are indicators of exhaust duct and/or make-

 

up

air

problems.

 

 

 

 

 

 

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