Maytag MDG25PN Service Manual page 22

B. Good
Allow as much room as possible when using elbows or making
turns. Bend vent gradually to avoid kinking.
Vent outlet is located at the center of the bottom dryer back.
The vent can be routed up, down, left, right, behind the dryer or
straight out the back of the dryer.
vent System Length
Vent System Length
Maximum length of vent system depends
upon the type of vent used, number of elbows
Maximum length of vent system depends upon the type of vent
used, number of elbows and type of exhaust hood. The maximum
and type of exhaust hood. The maximum
length for both rigid and flexible vent is shown in the chart.
length for both rigid and flexible vent is shown
in the chart.
Maximum Vent Length
4" (10.2 cm) Diameter Exhaust Hoods
Rigid Metal Vent
No. of 90° turns Box Hood and Louvered Style
0 135 ft. (41.2 m)
1 125 ft. (38.1 m)
2 115 ft. (35.1 m)
3 106 ft. (32.3 m)
4 98 ft. (29.9 m)
Flexible Metal Vent
No. of 90° turns Box Hood and Louvered Style
0 76 ft. (23.2 m)
1 71 ft. (21.6 m)
2 67 ft. (20.4 m)
3 65 ft. (19.8 m)
4 63 ft. (19.2 m)
If dryer is installed in a confined area, such
For vent systems not covered by the vent specification chart, see
as a bedroom, bathroom or closet, provision
Whirlpool Service Manual, "Exhausting Whirlpool Dryers," Part
No. LIT603197, available from your Whirlpool parts distributor.
must be made for enough air for combustion
If dryer is installed in a confined area, such as a bedroom,
and ventilation. (Check governing codes and
bathroom or closet, provision must be made for enough air for
ordinances.) See "Recessed Area and Closet
combustion and ventilation. (Check governing codes and
ordinances.) See "Recessed Area and Closet Installation
Installation Instructions" in the "Location
Instructions" in the "Location Requiements" section.
Requirements" section of the installation
A 4" (10.2 cm) outlet hood is preferred. However, a 2¹⁄₂" (6.4 cm)
instructions. Go to the Document Links Page
outlet exhaust hood may be used. A 2¹⁄₂" (6.4 cm) outlet creates
greater back pressure than other hood types. For permanent
installation, a stationary vent system is required.
4" (10.2 cm) outlet hoods are preferred. This
is a hood that measures 4" from the wall to the
bottom outside edge of the hood. However,
2 1/2" angled (6.4 cm) outlet exhaust hoods
may be used. 2 1/2" angled (6.4 cm) outlet
hoods create greater back pressure than other
hood types.
For permanent installation, a stationary
vent system is required. 4" rigid vent pipe
is always the preferred ventilation piping for
single-load dryer installations.
Static pressure measured at each dryer must
not exceed 1" or be less than .06" water
column.
direction of the airflow. Vents entering from the opposite side
should be staggered to reduce the exhausted air from interfering
with the other vents.
The maximum angle of each vent entering the main vent should
be no more than 30°.
Multiple Dryer venting
• A main vent can be used for venting a group
of dryers. Main vent should be sized to
remove 200 CFM of air per dryer. Large-
capacity lint screens of proper design may
be used in the main vent if checked and
cleaned frequently. The room where the
dryers are located should have make-up air
Keep air openings free of dry cleaning fluid fumes. Fumes create
equal to or greater than the CFM of all the
acids which, when drawn through the dryer heating units, can
dryers in the room, see below.
damage dryers and loads being dried.
A clean-out cover should be located on the main vent for periodic
Unobstructed air openings are required for
cleaning of the vent system.
Angled Hood Style
make up combustion air. A static opening
If an exhaust hood cannot be used:
129 ft. (39.3 m) of 24 square Inches (1 Inch ² per 1,000 BTU
The outside end of the main vent should have a sweep elbow
119 ft. (36.3 m)
of burner) is the minimum required for each
directed downward. If the main vent travels vertically through the
109 ft. (33.2 m)
dryer in operation. A common opening may
roof, rather than through the wall, install a 180° sweep elbow on
100 ft. (30.5 m)
be used if the return air is distributed equally
the end of the vent at least 2 ft. (61 cm) above the highest part of
92 ft. (28.0 m)
to all dryers in operation.
the building. The opening wall or roof shall have a diameter ¹⁄₂"
(1.3 cm) larger than the vent diameter. The vent should be
Angled Hood Style
centered in the opening.
• Back-draft dampers are available and
62 ft. (18.9 m)
should be installed in each dryer vent to
57 ft. (17.4 m)
53 ft. (16.2 m) avoid exhausted air from returning into the
51 ft. (15.6 m)
dryers and to keep the exhaust in balance
49 ft. (14.9 m)
within the main vent.
Each vent should enter the main vent at an
angle pointing in the direction of the airflow.
Vents entering from the opposite side should
be staggered to reduce the exhausted air from
interfering with the other vents.
interfering with the other vents.
Do not install screening or cap over the end of the vent.
The maximum angle of each vent entering the
main vent should be no more than 30°.
Keep air openings free of dry cleaning fluid
fumes. Fumes create acids which, when
drawn through the dryer heating elements,
can damage dryers and loads being dried.
A clean-out cover should be located on the
main vent for periodic cleaning of the vent
system.
2-4
A
30° max.
B
air flow
A. Individual dryer vent
B. Main vent
If using an existing vent system, clean lint from the entire len
of the system and make sure exhaust hood is not plugged w
lint. Replace any plastic or metal foil vent with rigid metal or
flexible metal vent.
Plan installation to use the fewest number of elbows and turn
B
A
Allow as much room as possible when using elbows or maki
turns. Bend vent gradually to avoid kinking.
D
Vent outlet is located at the center of the bottom dryer back.
The vent can be routed up, down, left, right, behind the dryer
straight out the back of the dryer.
Vent System Length
C
Maximum length of vent system depends upon the type of v
used, number of elbows and type of exhaust hood. The max
length for both rigid and flexible vent is shown in the chart.
F
Maximum Vent Length
air flow
Rigid Metal Vent
No. of 90° turns
0
1
2
3
4
Flexible Metal Vent
No. of 90° turns
0
1
2
3
4
For vent systems not covered by the vent specification chart
Whirlpool Service Manual, "Exhausting Whirlpool Dryers," Pa
No. LIT603197, available from your Whirlpool parts distributo
If dryer is installed in a confined area, such as a bedroom,
bathroom or closet, provision must be made for enough air f
A B
Exhaust Air Flow
A. Better
B. Good
C
A. Exhaust hood or elbow
B. Wall
C. Main collector vent
D. Horizontal vent
E. 180° sweep elbow
E
F. Vertical vent
G. Roof
2 ft. (61 cm) min. above
highest point of building
G 30˚ max.
4" (10.2 cm) Diameter Exhaust Hoods
Box Hood and Louvered Style
135 ft. (41.2 m)
125 ft. (38.1 m)
115 ft. (35.1 m)
106 ft. (32.3 m)
98 ft. (29.9 m)
Box Hood and Louvered Style
76 ft. (23.2 m)
71 ft. (21.6 m)
67 ft. (20.4 m)
65 ft. (19.8 m)
63 ft. (19.2 m)
9
Angled Hood Style
129 ft. (39.3 m)
119 ft. (36.3 m)
109 ft. (33.2 m)
100 ft. (30.5 m)
92 ft. (28.0 m)
Angled Hood Style
62 ft. (18.9 m)
57 ft. (17.4 m)
53 ft. (16.2 m)
51 ft. (15.6 m)
49 ft. (14.9 m)