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M_ltipteDryerVenting
[] Amain vent c anbeused forventing a group ofdryers. Main
vent s hould b esized toremove 200 CFM ofairperdryer.
Large-capacity
lintscreens ofproper design m ay beused in
themain vent i fchecked andcleaned frequently.
The room
where t hedryers a relocated s hould h ave make-up airequal
toorgreater than theCFM ofallthedryers i ntheroom.
[] Back-draft damper kitsareavailable and should beinstalled
ineach dryer's v ent t oprevent exhausted airfrom returning
into thedryers a nd tokeep theexhaust inbalance within the
main vent. U nobstructed
airopenings arerequired.
Each vent s hould e nter themain vent a tanangle pointing inthe
direction oftheairflow. Vents e ntering from theopposite side
should b estaggered toreduce t heexhausted airfrom interfering
with theother v ents.
The maximum a ngle ofeach vent e ntering themain vent s hould
benomore than 30 °.
A
air flow
_
B
_,_--
A. Individualdryervent
B.Main vent
Keep air openings free of dry cleaning fluid fumes. Fumes create
acids which, when drawn through the dryer heating units, 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.
if an exhaust hood cannot be used:
The outside end of the main vent should have a sweep elbow
directed downward. If the main vent travels vertically through the
roof, rather than through the wall, install a 180 ° sweep elbow on
the end of the vent at least 2 feet (61 cm) above the highest part
of the building. The opening wall or roof shall have a diameter 1A"
(! .3 cm) larger than the vent diameter. The vent should be
centered in the opening.
B
_C
A
A. Exhausthood or elbow
B. Wall
C. Maincollectorvent
D. Horizontal v ent
E. 180° sweepelbow
_
E
£ Verticalvent
G.Roof
_t.
(61 cm)
min.above
_hest
point of building
Do not install screening or cap over the end of the vent.
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