GE Appliances Profile PFDS450 Owner's Manual And Installation Instructions page 27

Installation Instructions
A WARNING - USE ONLY METAL
4" DUCT. DO NOT USE DUCT LONGER THAN
SPECIFIED IN THE EXHAUST LENGTH TABLE.
Using exhaust longer than specified length will:
, Increase the drying times and the energy cost.
, Reduce the dryer life.
, Accumulate lint, creating a potential
fire hazard.
The correct exhaust installation is YOUR
RESPONSIBILITY,
Problems due to incorrect installation
are not covered bg the warrantg.
The MAXIMUM ALLOWABLE length of
the exhaust system depends upon the type
of duct, number of turns, the type of exhaust
hood (wall cap) and all conditions noted below.
No. of 90°
Elbows
0
1
2
3
4
5
EXHAUST LENGTH
RECOMMENDED MAXIMUM LENGTH
Exhaust Hood Tgpes
Recommended Use only for short-
4" DIA
j_/ 4" DIA
_ 4" I_---
Rigid
Metal
150 Feet
155 Feet
125 Feet
115 Feet
105 Feet
95 Feet
run installations
4" DIA
Rigid
Metal
125 Feet
115 Feet
105 Feet
95 Feet
85 Feet
75 Feet
EXHAUST SYSTEM CHECKLIST
HOOD OR WALL CAP
, Terminate in a manner to prevent back drafts
or entry of birds or other wildlife.
, Termination should present minimal resistance
to the exhaust airflow and should require little
or no maintenance to prevent clogging.
, Never install a screen in or over the exhaust
duct. This could cause lint buildup.
. Wall caps must be installed at least 12" above
ground level or any other obstruction with the
opening pointed down.
SEPARATION OF TURNS
For best performance, separate all turns
by at least 4 ft. of straight duct, including
the distance between the last turn and
the exhaust hood.
TURNS OTHER THAN 90 °
. One turn of 45 ° or less may be ignored.
. Two 45 ° turns should be treated as one
90 ° turn.
, Each turn over 45 ° should be treated as
one 90 ° turn.
SEALING OF JOINTS
. All joints should be tight to avoid leaks.
The male end of each section of duct must
point away from the dryer.
, Do not assemble the ductwork with fasteners
that extend into the duct. They will serve as
a collection point for lint.
, Duct joints can be made air- and moisture-tight
by wrapping the overlapped joints with duct
tape.
, Horizontal runs should slope down toward
the outdoors 1/4" per foot.
INSULATION
Ductwork that runs through an unheated area
or is near air conditioning should be insulated
to reduce condensation and lint buildup.
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