Maytag MD-170PTVW, Installation Manual

16

Maytag Co.

113395 - 6

E.  EXHAUST REQUIREMENTS

Exhaust ductwork 

should be 

designed and installed by a qualified professional.  Improperly sized ductwork will

create excessive back pressure, which results in slow drying, increased use of energy, and shutdown of the
burner by the airflow (sail) switch, burner hi-limits, or lint chamber hi-limit protector thermostat.  The dryer 

must

be

 installed with a proper exhaust duct connection to the outside.

The dryer 

shall not be 

exhausted into any gas vent, chimney, wall, ceiling or concealed space of a building.

CAUTION:

This dryer produces combustible lint and 

must be 

exhausted to the outdoors.  Improperly

sized or installed exhaust ductwork can create a potential fire hazard.

The ductwork 

should be

 laid out in such a way that the ductwork travels as directly as possible to the outdoors

with as few turns as possible.  There 

should be

 a minimum 6-inch (15.24 cm) clearance between the back

guard and the first bend in the ductwork for ease of servicing.  Single or independent dryer venting is recommended.
It is suggested that the use of 90° turns be avoided; use 30° and/or 45° bends instead.  The radius of the elbows

should preferably be

 1-1/2 times the diameter of the duct.  

ALL

 ductwork 

should be

 smooth inside with no

projections from sheet metal screws or other obstructions, which will collect lint.  When adding ducts, overlap
the duct being connected.  

ALL

 ductwork joints 

must be

 taped to prevent moisture and lint from escaping into

the building.  Back draft dampers 

must be

 installed in 

ALL

 commonly ducted systems.  Inspection doors

should be

 installed at strategic points in the exhaust ductwork for periodic inspection and cleaning of lint from

the ductwork.

IMPORTANT: It

is

recommended

 that exhaust or booster fans not be used in the exhaust ductwork

system.

IMPORTANT:

Exhaust back pressure measured by a manometer/magnehelic in the exhaust duct

must be 

no less than 0 and 

must not exceed 

0.3 in WC (0.74 mb).

NOTE:

When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible
materials, the opening 

must be 

2-inches (5.08 cm) larger than the duct (all the way around).

The duct 

must be 

centered within this opening.

NOTE:

As per the National Fuel Gas Code, “Exhaust ducts for type 2 clothes dryers shall be
constructed of sheet metal or other noncombustible material.  Such ducts shall be equivalent in
strength and corrosion resistance to ducts made of galvanized sheet steel not less than 26
gauge (0.0195-inches [0.50 mm]) thick.”

The ductwork for this appliance 

must be

 suitable for the appliance category in accordance with national installation

regulations of the country of destination.

Outside Ductwork Protection

To protect the outside end of the horizontal ductwork from the weather, a 90° elbow bent downward 

should be

installed where the exhaust exits the building.  If the ductwork travels vertically up through the roof, it 

should be

protected from the weather by using a 180° turn to point the opening downward.  In either case, allow at least
twice the diameter of the duct between the duct opening and the nearest obstruction (refer to the diagram).

IMPORTANT:

DO NOT 

use screens, louvers, or caps on the outside opening of the exhaust

ductwork.