American Dryer Corp. MLG-130DR (HSI) User manual

For replacement parts, contact the distributor from which the dryer
was purchased or
American Dryer Corporation
88 Currant Road
Fall River MA 02720 4781
Telephone: [phone] / Fax: [phone]
E mail: [e-mail]
WARNING: For your safety the
information in this manual must be
followed to minimize the risk of fire or
explosion or to prevent property dama e,
personal injury or death.
Do not store or use asoline or other flammable
vapor and liquids in the vicinity of this or any
other appliance.
WHAT DO YOU DO IF YOU SMELL GAS
* Do not try to li ht any appliance.
* Do not touch any electrical switch; do not use
any phone in your buildin .
* Clear the room, buildin or area of all
occupants.
* Immediately call your as supplier from a
nei hbor's phone. Follow the as supplier's
instructions.
* If you cannot reach your as supplier, call the
fire department.
Installation and service must be performed by a
qualified installer, service a ency or the as
supplier.
AVERTISSEMENT: Assurez-vous de bien
suivre les instructions données dans cette
notice pour réduire au minimum le risque
dincendie ou dexplosion ou pour éviter tout
domma e matériel, toute blessure ou la mort.
Ne pas entreposer ni utiliser dessence ni
dautres vapeurs ou liquides inflammables dans
le voisina e de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
* Ne pas tenter dallumer dappareil.
* Ne touchez à aucun interrupteur. Ne pas
vous servir des téléphones se trouvant dans
le bâtiment où vous vous trouvez..
* Évacuez la pièce, le bâtiment ou la zone.
* Appelez immédiatement votre fournisseur de
az depuis un voisin. Suivez les instructions
du fournisseur.
* Si vous ne pouvez rejoindre le fournisseur
de az, appelez le service des incendies.
Linstallation et lentretien doivent être assurés
par un installateur ou un service dentretien
qualifié ou par le fournisseur de az.
MLG-130DR (HSI)
Installation Manual
030600JJB/tcosta ADC Part No. 113130

MLG-130DR
Retain This Manual In A Safe Place For Future Reference
Replacement parts can be obtained from your distributor or the ADC factory. When ordering replacement parts from the
factory, you can FAX your order to ADC at (508 678-9447 or telephone your orders directly to the ADC Parts Department at
(508 678-9000. Please specify the dryer model number and serial number in addition to the description and part number, so
that your order is processed accurately and promptly.
DATE OF PURCHASE MODEL NO.
DISTRIBUTORS NAME
Serial Number(s)
IMPORTANT NOTE TO PURCHASER
Information must be obtained from your local as supplier on the instructions
to be followed if the user smells as. These instructions must be posted in a
prominent location near the dryer.
American Dryer Corporation products embody advanced concepts in engineering, design, and safety. If this product is
properly maintained, it will provide many years of safe, efficient, and trouble-free operation.
ONLY qualified technicians should service this equipment.
OBSERVE ALL SAFETY PRECA TIONS displayed on the equipment or specified in the installation/operator's manual
included with the dryer.
The following FOR YO R SAFETY caution must be posted near the dryer in a prominent location.
FOR YOUR SAFETY
Do not store or use asoline or
other flammable vapors or
liquids in the vicinity of this or
any other appliance.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser dessence
ni dautres vapeurs ou liquides
inflammables dans le voisina e de cet
appareil ou de yout autre appareil.
We have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the right to make
changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change or
discontinue models.
Important
For your convenience, log the following information:

IMPORTANT
YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS
SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE
TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING
OF ANY EQUIPMENT er OSHA (Occupational Safety and Health Administration)
STANDARDS.
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYER(S).
WARNING
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER(S) IN OPERATION.
DRYER(S) SHOULD NE ER BE LEFT UNATTENDED WHILE IN OPERATION.
CAUTION
FOR YOUR SAFETY
DO NOT DRY MOP HEADS IN THE DRYER.
DO NOT USE DRYER IN THE PRESENCE OF DRY CLEANING FUMES.
WARNING
UNDER NO CIRCUMSTANCES should the door switch or the heat circuit devices
ever be disabled.
Caution: Label all wires prior to
disconnection when servicing controls. Wiring
errors can cause improper operation.
«Attention: Lor des opérations dentretien
des commandes étiqueter tous fils avant
de les déconnecter. Toute erreur de
câblage peut étre une source de danger et
de panne.»

WARNING
The dryer must never be o erated with any of the back guards, outer to s, or service
anels removed. PERSONAL INJURY or FIRE COULD RESULT.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS dis layed on the equi ment and/or
s ecified in the installation and o erator's manual included with the dryer.
Dryers must not be installed or stored in an area where it will be exposed to water or weather.
The wiring diagram for the dryer is located in the front electrical control box area.
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN IN
PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
WARNING

Table of Contents
SECTION I
IMPORTANT INFORMATION ............................................................................... 3
A. Receivin and Handlin ............................................................................................................... 3
B. Safety Precautions ...................................................................................................................... 4
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION .................................... 6
A. Specifications ............................................................................................................................. 6
B. Component Identification ............................................................................................................ 8
SECTION III
INSTALLATION PROCEDURES ......................................................................... 10
A. Location Requirements ............................................................................................................. 10
B. Unpackin /Settin Up ............................................................................................................... 11
C. Dryer Enclosure Requirements .................................................................................................. 13
D. Fresh Air Supply Requirements ................................................................................................. 14
E. Exhaust Requirements ............................................................................................................... 15
F. Electrical Information ................................................................................................................ 20
G. Gas Information ........................................................................................................................ 23
H. Preparation For Operation/Start-Up ......................................................................................... 27
I. Preoperational Tests ................................................................................................................. 27
J. Operatin Instructions ............................................................................................................... 29
K. Shut Down Instructions ............................................................................................................. 30
SECTION IV
SERVICE/PARTS INFORMATION ...................................................................... 31
A. Service ..................................................................................................................................... 31
B. Parts ........................................................................................................................................ 31
SECTION V
WARRANTY INFORMATION
A. Returnin Warranty Card(s) ...................................................................................................... 32
B. Parts ........................................................................................................................................ 32
C. Returnin Warranty Part(s) ........................................................................................................ 32

SECTION VI
ROUTINE MAINTENANCE .................................................................................. 34
A. Cleanin ................................................................................................................................... 34
B. Adjustments ............................................................................................................................. 35
C. Lubrication ............................................................................................................................... 35
SECTION VII
REVERSING TIMER SPIN/DWELL ADJUSTMENTS .....................................36
SECTION VIII
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS ........................................................................................................37
SECTION IX
URNER and LINT (TUM LER) CHAM ER MANUAL RESET
HI-LIMIT INSTRUCTIONS ................................................................................... 40

3
SECTION I
IMPORTANT INFORMATION
A. RECEIVING and HANDLING
The dryer is shipped in a protective stretch wrap cover with protective cardboard corners and top cover (or
optional box) as a means of preventing damage in transit. Upon delivery, the dryer and/or packaging, and wooden
skid should be visually inspected for shipping damage. f any damage whatsoever is noticed, inspect further
before delivering carrier leaves.
Dryers damaged in shipment:
1. ALL dryers should be inspected upon receipt and before they are signed for.
2. f there is suspected damage or actual damage, the truckers receipt should be so noted.
3. f the dryer is damaged beyond repair, it should be refused. Those dryers which were not damaged in a
damaged shipment should be accepted, but the number received and the number refused must be noted
on the receipt.
4. f you determine that the dryer was damaged after the trucker has left your location, you should call the
delivering carriers freight terminal immediately and file a claim. The freight company considers this concealed
damage. This type of freight claim is very difficult to get paid and becomes extremely difficult when more
than a day or two (2) passes after the freight was delivered. t is your responsibility to file freight claims.
Dryer/parts damaged in transit cannot be claimed under warranty.
5. Freight claims are the responsibility of the consignee, and ALL claims must be filed at the receiving end.
ADC assumes no responsibility for freight claims or damages.
6. f you need assistance in handling the situation, please contact the ADC Traffic Manager at [phone].
IMPORTANT: The dryer must be transported and handled in an upri ht position at ALL times.

4
B. SAFETY PRECAUTIONS
WARNING: For your safety, the information in this manual must be followed to minimize the risk of
fire or explosion or to prevent property dama e, personal injury, or loss of life.
WARNING: The dryer must never be opera ed wi h any of he back guards, ou er ops, or
service panels removed. PERSONAL INJURY or FIRE COULD RESULT.
1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
2. Purchaser/user should consult the local gas supplier for proper instructions to be followed in the event the
user smells gas. The instructions should be posted in a prominent location.
3. WHAT TO DO F YOU SMELL GAS...
a. DO NOT try to light any appliance.
b. DO NOT touch any electrical switch.
c. DO NOT use any phone in your building.
d. Clear the room, building, or area of ALL occupants.
e. mmediately call your gas supplier from a neighbors phone. Follow the gas suppliers instructions.
f. f you cannot reach your gas supplier, call the fire department.
4. nstallation and service must be performed by a qualified installer, service agency, or gas supplier.
5. Dryer(s) must be exhausted to the outdoors.
6. Although ADC produces a very versatile machine, there are some articles that, due to fabric composition or
cleaning method, should not be dried in it.
WARNING: Dry only water-washed fabrics. DO NOT dry articles spotted or washed in dry
cleanin solvents, a combustible deter ent, or all purpose cleaner.
EXPLOSION COULD RESULT.
WARNING: DO NOT dry ra s or articles coated or contaminated with asoline, kerosene, oil, paint,
or wax.
EXPLOSION COULD RESULT.
WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvent will create a fire
hazard.
WARNING: DO NOT use heat for dryin articles that contain plastic, foam, spon e rubber, or
similarly textured rubberlike materials. Dryin in a heated tumbler (basket) may dama e
plastics or rubber and also may be a fire hazard.

5
7. A program should be established for the inspection and cleaning of lint in the burner area, exhaust duct
work, and area around the back of the dryer. The frequency of inspection and cleaning can best be
determined from experience at each location.
WARNING: The collection of lint in the burner area and exhaust duct work can create a potential fire
hazard.
8. For personal safety, the dryer must be electrically grounded in accordance with local codes and/or the
National Electrical Code ANS /NFPA NO. 70-LATEST ED T ON, or in Canada, the Canadian Electrical
Codes Parts 1 & 2 CSA C22.1-1990 or LATEST ED T ON.
NOTE: Failure to do so will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer door switches, lint drawer switch, or heat safety
circuit, ever be disabled.
WARNING: PERSONAL INJURY or FIRE COULD RESULT.
10. This dryer is not to be used in the presence of dry cleaning solvents or fumes.
11. Remove articles from the dryer as soon as the drying cycle has been completed.
WARNING: Articles left in the dryer after the dryin and coolin cycles have been complete can
create a fire hazard.
12. READ and FOLLOW ALL CAUTION and DIRECTION LABELS ATTACHED TO THE DR ER.
WARNING: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and
THE GAS SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED
FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING,
ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per
OSHA (Occupational Safety and Health Administration) STANDARDS.

6
Gas
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION
A. SPECIFICATIONS
NOTE: ADC reserves the ri ht to make chan es in specifications at any time, without notice or
obli ation.
M AXIMUM C APACITY ( DRY WEIGHT )130lbs. 60 kg
T
UMBLER (B ASKET ) D IAMETER 44-1/2” 113 cm
T
UMBLER (B ASKET ) D EPTH 42-1/2” 107.9 cm
T
UMBLER (B ASKET) M OTOR 3/4 HP .560 kw
B
LOWER M OTOR 3 HP 2.238 kw
D
OOR O PENING (D IAMETER ) 31-3/8” 79.7 cm
T
UMBLER (B ASKET ) V OLUME 38.2 cu. ft. 1.08 cu.m.
D
RYERS P ER 20’/40’ C ONTAINER 3/7
D
RYERS P ER 45’/48’ T RUCK 9/9
V
OLTAGE A VAILABLE 208-460v 3ø 3, 4w 50/60Hz
H
EAT I NPUT 300,000 btu/hr 75,600 kcal/hr
A
PPROX . W EIGHT ( UNCRATED ) 1,500 lbs. 680.4 kg
A
PPROX . W EIGHT ( CRATED ) 1,725 lbs. 782.5 kg
A
IRFLOW 1,750 cfm 49.6 cmm
I
NLET P IPE S IZE 1” 2.54 cm
Shaded areas are stated in metric equivalents

7
NOTE: ADC reserves the ri ht to make chan es in specifications at any time, without notice or
obli ation.
Specifications
MLG-130DR

8
B. COMPONENT IDENTIFICATION
1. Dryer Front View
llus. No. Description
1 Microprocessor Control/Keyboard (Touchpad) Panel Assembly (Controls)
2 Control (Top Access) Door Assembly
3 Main Door Assembly
4 Lint Door Assembly
5 Lint Drawer
6 EMERGENCY STOP (E-Stop) Button
7 Wire Diagram (located behind Control Door)
8 Top Console (Module) Assembly

9
2. Dryer Rear View
llus. No. Description
1 Basket (drive) Motor Assembly
2 Blower Motor Mount Assembly
3 mpellor (fan/blower) Assembly
4 dler Bearing Mount Assembly
5 Tumbler Bearing Mount Assembly
6* Electric Service Relay Box
7 Heating Unit
8 Data Label and nstallation Label
* Electric service connections are made in this box.

10
SECTION III
INSTALLATION PROCEDURES
nstallation should be performed by competent technicians in accordance with local and state codes. n the
absence of these codes, the installation must conform to applicable American National Standards: ANS .Z223.1-
LATEST ED T ON (National Fuel Gas Code) or ANS /NFPA NO. 70-LATEST ED T ON (National Electrical
Code). n Canada, the installation must conform to Canadian Standards: CAN/CGA-B149.1-M91 (Natural
Gas) or CAN/CGA-B149.2-M91 (L.P. Gas) or LATEST ED T ON (for General nstallation and Gas Plumbing)
or Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST ED T ON (for Electrical Connections).
A. LOCATION REQUIREMENTS
Before installing the dryer, be sure the location conforms to local codes and ordinances. n the absence of such
codes or ordinances the location must conform with the National Fuel Gas Code ANS .Z223.1-LATEST
ED T ON.
1. The dryer must be installed on a sound level floor capable of supporting its weight. t is recommended that
carpeting be removed from the floor area that the dryer is to rest on.
2. The dryer must not be installed or stored in an area where it will be exposed to water and/or weather.
3. The dryer is for use in noncombustible locations.
4. Provisions for adequate air supply must be provided as noted in this manual (refer to Fresh Air Supply in
Section D).
5. Clearance provisions must be made from combustible construction as noted in this manual (refer to Dryer
Enclosure Requirements in Section C).
6. Provisions must be made for adequate clearances for servicing and for operation as noted in this manual
(refer to Dryer Enclosure Requirements in Section C).
7. Dryer must be exhausted to the outdoors (refer to Exhaust Requirements in Section E).
8. Dryer must be located in an area where correct exhaust venting can be achieved as noted in this manual
(refer to Exhaust Requirements in Section E).
IMPORTANT: Dryer should be located where a minimum amount of exhaust duct will be necessary.

11
B. UNPACKING/SETTING UP
Remove protective shipping material (i.e., plastic wrap and/or optional shipping box) from dryer.
IMPORTANT: Dryer must be transported and handled in an upri ht position at ALL times.
The dryer can be moved to its final location while still attached to the skid or with the skid removed. To un-skid
the dryer, locate and remove the four (4) lag bolts securing the base of the dryer to the wooden skid. Two (2) are
at the rear base, and two (2) are located in the bottom of the lint chamber. To remove the two (2) lag bolts located
in the lint chamber area, remove the lint drawer and the three (3) Phillips head screws securing the lint door in
place.
1. Leveling Dryer
a. To level the dryer, place 4-inch (10.16 cm) metal
shims (refer to the illustration) or other suitable
material under the base pads. t is suggested that
the dryer be tilted slightly to the rear.
2. f more headroom is needed when moving the dryer
into position, the top console (module) may be
removed. To remove the Top Console (module);
a. Rear of Dryer (refer to the illustration on page
12)...
1) Disconnect the four (4) pin EMERGENCY
STOP (E-Stop) Connector B .
2) Remove the Drive Motor blue wires C
marked 1, 2, 3 from the Drive Motor
Reversing Contactor T1, T2, T3.
3) Remove the Blower Motor red wires D
marked 1, 2, 3 from the Blower Motor
Overload T1, T2, T3.
4) Disconnect the two (2) pin Rotational Sensor Connector E .
b. Front of Dryer...
1) Open the Control Door
a) Remove the Phillips head screw from the bottom right of the Phase 6 Microprocessor Controller
(computer) Keyboard (touchpad) Panel Assembly.
b) Open the keyboard (touchpad) door.
2) Disconnect the four (4) pin connector.
3) Disconnect the two (2) pin connector.

12
4) Disconnect the two (2) pin connector from the Phase 6 Microprocessor Controller (computer).
Refer to the wiring diagram on the Control Door.
5) Disconnect the ground (GND) wire from the Phase 6 Microprocessor Controller (computer).
NOTE: b 2 and b 3 apply only to models manufactured after Au ust 1997. Models manufactured
prior to Au ust 1997 require a Pin Extraction Tool (ADC Part No. 122800) to remove the
pins from their connectors.
c. Top of Dryer (refer to the illustration below)...
1) Remove the eight (8) sets of nuts and washers F holding the console (module) to the base.
IMPORTANT: The dryer must be transported and handled in an upri ht position at ALL times.

13
C. DRYER ENCLOSURE REQUIREMENTS
Even though a 12-inch (30.48 cm) clearance is acceptable, it is recommended that the rear of the dryer be
positioned approximately two (2) feet (24-inches) - 0.61 meters (60.96 cm) - from the nearest obstruction (i.e.,
wall) for ease of installation, maintenance, and service. Bulkheads and partitions should be made from
noncombustible materials. The clearance between the bulkhead header and the dryer must be a minimum of 4-
inches (10.16 cm) and must not extend more than 4-inches (10.16 cm) to the rear of the front. The bulkhead
facing must not be closed in ALL the way to the top of the dryer. A 2-inch (5.08 cm) clearance is required.
NOTE: Bulkhead facin should not be installed until after the dryer is in place. Ceilin area must be
located a minimum of 12-inches (30.48 cm) above the top of the dryer.
IMPORTANT: Even thou h a minimum of only 12-inches (30.48 cm) is required, 18-inches (45.72
cm) or more is su ested, for steam dryers and especially in cases where sprinkler
heads are over the dryers.
NOTE: When fire sprinkler systems are located above the dryers, a minimum of 18-inches (45.72 cm)
above the dryer console (module) is su ested. Dryers may be positioned side wall to side
wall, however, 1 or 2-inches (2.54 or 5.08 cm) is su ested for ease of installation and
maintenance. Allowances must be made for the openin and closin s of the control door and
the lint door.

14
D. FRESH AIR SUPPLY REQUIREMENTS
When the dryer is operating, it draws in room air, heats it, passes this air through the tumbler (basket), and
exhausts it out of the building. Therefore, the room air must be continually replenished from the outdoors. f the
make-up air is inadequate, drying time and drying efficiency will be adversely affected. gnition problems and sail
switch fluttering problems may result, as well as premature motor failure from overheating.
Air supply (make-up air) must be given careful consideration to assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An airflow of 1,750 cfm (cubic feet per minute) - 49.55
cmm - must be supplied to each dryer. As a general rule, an unrestricted air entrance from the outdoors
(atmosphere) of a minimum of 300 square inches (1935.48 square centimeters) is required for each dryer.
To compensate for the use of registers or louvers used over the openings, this make-up air must be increased by
approximately thirty-three percent (33%). Make-up air openings should not be located in an area directly near
where exhaust vents exit the building.
t is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are
acceptable. However, they must be set up in such a manner that the make-up air is distributed equally to ALL
the dryers.
EXAMPLE: For a bank of six (6) dryers, two (2) unrestricted openings measuring 36-inches
by 25-inches (1800 square inches) - 91.44 cm by 63.5 cm (11612.88 square
centimeters) is acceptable.
Allowances must be made for remote or constricting passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
IMPORTANT: Make-up air must be provided from a source free of dry cleanin solvent fumes.
Make-up air that is contaminated by dry cleanin solvent fumes will result in
irreparable dama e to the motors and other dryer components.
NOTE: Component failure due to dry cleanin solvent fumes will VOID THE WARRANTY.

15
E. EXHAUST REQUIREMENTS
1. General Exhaust Duct Work nformation
Exhaust duct work should be designed and installed by a qualified professional. mproperly sized duct
work will create excessive back pressure which results in slow drying, increased use of energy, overheating
of the dryer, and shut down of the burner by the airflow (sail) switches, burner hi-limits, or tumbler (basket)
hi-heat thermostats.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
NOTE: When a dryer is exhausted separately, i is recommended that a back draft damper be
installed.
NOTE: When dryers are exhausted into a multiple (common) exhaust line, each dryer must be
supplied with a back draft damper.
The duct work should be laid out in such a way that the duct work travels as directly as possible to the
outdoors with as few turns as possible. Single or independent dryer venting is recommended. When single
dryer venting is used, the duct work from the dryer to the outside exhaust outlet should not exceed 20 feet
(6.09 meters). n the case of multiple (common) dryer venting, the distance from the last dryer to the
outside exhaust outlet should not exceed 20 feet (6.09 meters). The shape of the duct work is not so
critical so long as the minimum cross-sectional area is provided. t is suggested that the use of 90º turns be
avoided; use 30º and/or 45º bends/angles instead. The radius of the elbows should preferably be 1-1/2
times the diameter of the duct. Excluding tumbler (basket)/dryer elbow connections or elbows used for
outside protection from the weather, no more than three (3) elbows should be used in the exhaust duct run.
f more than three (3) elbows are used, the cross-sectional area of the duct work must be increased in
proportion to the number of elbows used.
ALL duct work should be smooth inside with no projections from sheet metal screws or other obstructions
which will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be
connected. ALL duct work joints must be taped to prevent moisture and lint from escaping into the
building. nspection door should be installed at strategic points in the exhaust duct work for periodic
inspection and clean-out of lint from the duct work.
IMPORTANT: Exhaust back pressure measured by a manometer in the exhaust duct should not
exceed 0.3 inches of water column (0.74 mb).
NOTE: Where the exhaust duct work passes throu h a wall, ceilin , or roof made of combustible
materials, the openin must be 2-inches (5.08 cm) lar er (all the way around) than the duct.
The duct must be centered within this openin .

16
a. Outside Duct Work Protection
1) To protect the outside end of horizontal duct work from the weather, a 90° elbow bent downward
should be installed where the exhaust exits the building. f the duct work travels vertically up
through the roof, it should be protected from the weather by using a 180° turn to point the opening
downward. n either case, allow at least twice the diameter of the duct between the duct opening
and the nearest obstruction.
IMPORTANT: DO NOT use screens or caps on the outside of openin of exhaust duct work.
2. Single Dryer Venting
Where possible, it is suggested to provide a separate exhaust duct for each dryer. The exhaust duct should
be laid out in such a way that the duct work travels as directly as possible to the outdoors with as few turns
as possible. t is suggested that the use of 90° turns in the ducting be avoided; use 30° and/or 45° angles
instead. The shape of the exhaust duct work is not critical so long as the minimum cross section area is
provided.
IMPORTANT: Minimum duct size for a dryer is 12-inches (30.48 cm) for a round duct 10-3/4 x
10-3/4 (27.31 cm x 27.31 cm) for a square duct. THE DUCT SIZE MUST NOT
BE REDUCED ANYWHERE DOWN STREAM OF THE DRYER.
IMPORTANT: Exhaust back pressure measured by a manometer at each tumbler (basket) exhaust
duct area should not exceed 0.3 inches of water column (0.74 mb).