ADC AD-60 User manual

051700JEV/rar ADC Part No. 113154
For replacement parts, contact the reseller
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]
www.amdry.com
WARNING: For your safety the
information in this manual must be
followed to minimize the risk of fire or
explosion or to prevent property damage,
personal injury or death.
Do not store or use gasoline 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 light any appliance.
* Do not touch any electrical switch; do not use
any phone in your building.
* Clear the room, building or area of all
occupants.
* Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
* If you cannot reach your gas supplier, call the
fire department.
Installation and service must be performed by a
qualified installer, service agency or the gas
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
dommage matériel, toute blessure ou la mort.
Ne pas entreposer ni utiliser d’essence ni
d’autres vapeurs ou liquides inflammables dans
le voisinage 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
gaz depuis un voisin. Suivez les instructions
du fournisseur.
* Si vous ne pouvez rejoindre le fournisseur
de gaz, 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 gaz.
AD-60
Installation Manual

Retain This Manual In ASafe Place For Future Reference
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 PRECAUTIONS displayed on the equipment or specified in the installation manual included with
the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
AD-60
“IMPORTANT NOTE TO PURCHASER”
Information must be obtained from your local gas supplier on the instructions
to be followed if the user smells gas. These instructions must be posted in a
prominent location near the dryer.
FOR YOUR SAFETY
Do not store or use gasoline 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 voisinage 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:
DATE OF PURCHASE ____________________________ MODEL NO. __________________________________________
RESELLER’S NAME _______________________________________________________________________________________
Serial Number(s) ________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement parts from the factory,
you can FAX your order to ADC at [phone] or telephone your order directly to the ADC Parts Department at
[phone]. 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.

IMPORTANT
YOU MUST DISCONNECT AND LOCKOUTTHE ELECTRIC SUPPLY AND THE GAS
SUPPLY OR THE STEAM 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 HealthAdministration) STANDARDS.
WARNING
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYER(S).
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYERS IN OPERATION.
CAUTION
DRYERS SHOULD NEVER BE LEFT UNATTENDEDWHILE IN OPERATION.
FOR YOUR SAFETY
DO NOT DRYMOPHEADS INTHE DRYER.
DO NOT USE DRYER IN THE PRESENCE OF DRY CLEANING FUMES.
WARNING
UNDER NO CIRCUMSTANCES should the dryer 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 operated with any of the back guards, outer tops, or service
panels removed. PERSONAL INJURY OR FIRE COULD RESULT.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and/or
specified in the installation manual included with the dryer.
WARNING
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN IN
PLACE, EVEN IFAN EXTERNALLINT COLLECTION SYSTEM IS USED.
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.

Table of Contents
SECTION I
IMPORTANT INFORMATION ............................................................................... 3
A. Receiving and Handling ............................................................................................................. 3
B. Safety Precautions ..................................................................................................................... 4
SECTION II
SPECIFICATIONS .................................................................................................... 6
A. Specifications ............................................................................................................................ 6
SECTION III
INSTALLATION PROCEDURES ........................................................................... 8
A. Unpacking/Setting Up ................................................................................................................ 8
B. Location Requirements .............................................................................................................. 9
C. Dryer Enclosure Requirements .................................................................................................. 10
D. FreshAir Supply Requirements ................................................................................................ 11
E. Exhaust Requirements .............................................................................................................. 12
F. Electrical Information ............................................................................................................... 18
G. Gas Information ....................................................................................................................... 25
H. Steam Information ................................................................................................................... 29
I. Preparation For Operation/Start-Up ........................................................................................ 34
J. Preoperational Tests ................................................................................................................ 35
K. Preoperational Instructions ....................................................................................................... 36
L. Shut Down Instructions ............................................................................................................. 39
SECTION IV
SERVICE/PARTS INFORMATION ...................................................................... 40
A. Service .................................................................................................................................... 40
B. Parts ........................................................................................................................................ 40
SECTION V
WARRANTY INFORMATION .............................................................................. 41
A. Returning Warranty Cards ......................................................................................................... 41
B. Warranty .................................................................................................................................. 41
C. Returning Warranty Parts .......................................................................................................... 41

SECTION VI
ROUTINE MAINTENANCE .................................................................................. 43
A. Cleaning ................................................................................................................................... 43
B. Adjustments ............................................................................................................................. 44
C. Lubrication ............................................................................................................................... 44
SECTION VII
TROUBLESHOOTING ........................................................................................... 45
Microprocessor Controller (Computer) Models .............................................................................. 45
Dual Timer Models ......................................................................................................................... 51
SECTION VIII
DATA LABEL INFORMATION ............................................................................. 55
A. Data Label ............................................................................................................................... 55
SECTION IX
REVERSING TIMER SPIN/DWELL ADJUSTMENTS .................................... 57
SECTION X
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS ....................................................................................................... 58
SECTION XI
MANUAL RESET HI-LIMIT INSTRUCTIONS ................................................. 61
Gas Models Only ........................................................................................................................... 61
Electric or Steam Models Only ....................................................................................................... 62

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 packaging, and wooden
skid should be visually inspected for shipping damage. If 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. If there is suspected damage or actual damage, the trucker’s receipt should be so noted.
3. If 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. If 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 passes after the freight was delivered. It 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. If you need assistance in handling the situation, please contact the ADC Traffic Manager at (508)
678-9000.
IMPORTANT: The dryer must be transported and handled in an upright 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 damage, personal injury, or loss of life.
WARNING: The dryer must never be operated with any of the back guards, outer tops, 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 IF 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. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
f. If you cannot reach your gas supplier, call the fire department.
4. Installation 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 dryer, 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
cleaning solvents, a combustible detergent, or “all purpose” cleaner.
EXPLOSION COULD RESULT.
WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint,
or wax.
EXPLOSION COULD RESULT.
WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvents will create a
fire hazard.
WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or
similarly textured rubber materials. Drying in a heated basket (tumbler) may damage
plastics or rubber and may be a fire hazard.

5
7. A program should be established for the inspection and cleaning of lint in the burner area, exhaust ductwork,
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 ductwork 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 ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the Canadian Electrical
Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION.
NOTE: Failure to do so will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer door switch or the heat circuit devices 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 drying and cooling cycles have been completed can
create a fire hazard.
12. READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE
DRYER.
13. For safety, proper operation, and optimum performance, the dryer must not be operated with a load less
than sixty-six percent (66%), 40 lbs (18 kg) of its rated capacity.
WARNING: YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPLY AND
THE GAS SUPPLY OR THE STEAM SUPPLY BEFORE ANY COVERS OR
GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS
FOR CLEANING, ADJUSTING, INSTALLATION, OR TESTING OFANY
EQUIPMENT PER OSHA (Occupational Safety and HealthAdministration)
STANDARDS.

6
SECTION II
SPECIFICATIONS
A. SPECIFICATIONS
* AD-60 single-phase (1ø) dryers use a 3/4 HP (0.56 kw) motor. AD-60 3-phase (3ø) non-reversing dryers use a 1/2 HP (0.37 kw)
motor. ALL AD-60 reversing dryers are supplied with two (2) 3-phase (3ø) motors standard: a 1/2 HP (0.37 kw) blower motor and
a 1/2 HP (0.37 kw) drive motor.
** Size of piping to dryer varies with installation conditions. Contact factory for assistance.
*** Contact factory for electrical information not listed. 3-phase (3ø) figures shown are for 3-wire service.
**** Specify air-operated or electromechanical steam damper system when ordering. Air-operated steam damper must be provided with
a clean, dry, and regulated 80 PSI +/- 10 PSI (5.51 bars +/- 0.69 bars) air supply.
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
Gas
Electric
Steam****
MAXIMUM CAPACITY (DRY WEIGHT) 60 lbs 25 kg
BASKET (TUMBLER) DIAMETER 37” 94 cm
BASKET (TUMBLER) DEPTH 30” 76.2 cm
BASKET (TUMBLER) MOTOR* 3/4 HP 0.56 kw
DOOR OPENING (DIAMETER) 31-3/8” 79.7 cm
BASKET (TUMBLER) VOLUME 18.67 cu.ft. 0.528 cu.m.
DRYERS PER 20’/40’ CONTAINER 10/20
DRYERS PER 45’/48’ TRUCK 24/26
VOLTAGE AVAILABLE 120-460v 1,3ø 3,4w 50/60 Hz
APPROX. NET WEIGHT 595 lbs 269.9 kg
APPROX. SHIPPING WEIGHT 645 lbs 292.6 kg
HEAT INPUT 160,000 btu/hr 40,320 kcal/hr
AIRFLOW 600 cfm 17 cmm
INLET PIPE CONNECTION** 1/2” M.P.T.
OVEN SIZE
KW BTU/HR
60
H Z
KCAL/HR
50
H Z
20 68,250 17,200
24 81,900 20,640
30 102,400 25,800
APPLIED VOLTAGE/PHASE/APPROX. AMP DRAW***
KW 208/1ø 240/1ø 208/3ø 240/3ø 380/3ø 416/3ø 460/3ø
60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 50/60 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz
20 103 -90 - -- - -33 ----
24 ----70 -62 ---36 31 -
30 ----86 -75 ---44 38 -
VOLTAGE AVAILABLE 120-460v 1,3ø 3w,4w 50/60 Hz
APPROX. NET WEIGHT 625 lbs 283.5 kg
APPROX. SHIPPING WEIGHT 675 lbs 306.2 kg
AIRFLOW 600 cfm 17 cmm
COMPRESSED AIR VOLUME 0.75 cfh 0.02 cmh
COMPRESSED AIR CONNECTION 1/8” F.P.T.
STEAM CONSUMPTION BOILER HP NORMAL LOAD
144.7 lbs/hr 65.7 kg/hr 4.2
OPERATING STEAM PRESSURE SUPPLY CONNECTION** RETURN CONNECTION**
125 PSI max 8.6 bars 1” F.P.T. 1” F.P.T.
Shaded areas are stated in metric equivalents

7
Specifications
ADG-60
ADE-60
ADS-60
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.

8
SECTION III
INSTALLATION PROCEDURES
Installation should be performed by competent technicians in accordance to local and state codes. In the
absence of these codes, the installation must conform to applicable American National Standards: ANSI Z223.1-
LATEST EDITION (National Fuel Gas Code) or ANSI/NFPA NO. 70-LATEST EDITION (National Electrical
Code) or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91
(Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.] Gas) or LATEST EDITION (for General
Installation and Gas Plumbing) or Canadian Electrical Codes Parts 1 and 2 CSA C22.1-1990 or LATEST EDITION
(for Electrical Connections).
A. UNPACKING/SETTING UP
Remove protective shipping material (i.e., plastic wrap and optional shipping box) from dryer.
IMPORTANT: Dryer must be transported and handled in an upright position at ALL times.
NOTE: For OPL dryer models equipped with locks, the lock used is a dummy lock and no key is
supplied or needed. The lock can be turned with any key, a screwdriver, a small coin, or any
small sharp object. For coin-operated dryers, the MK-100 (master key for both the control
door and lint door) should be made accessible because it will be needed throughout various
phases in the installation of the dryer.
The dryer can be moved to its final location while still attached to the skid or with the skid removed. To unskid
the dryer, locate and remove the four (4) bolts securing the base of the dryer to the wooden skid. Two (2) are
at the rear base (remove the back panel for access), and two (2) are located in the bottom of the lint chamber.
To remove the two (2) bolts located in the lint chamber area, remove the lint door.
With the skid removed, to make it easier to slide the dryer into its final position, slightly lower ALL four (4)
leveling legs, so that the dryer will slide on the legs instead of the base frame.
To increase bearing life and improve efficiency, the dryer should be tilted slightly to the rear.
1. Leveling Dryer
The dryer is equipped with four (4) leveling legs, one (1) at each corner of the base. Two (2) are located
at the rear of the dryer base, and two (2) are located in the lint chamber (coop). To increase bearing life
and improve efficiency, the dryer should be tilted slightly to the rear.

9
B. LOCATION REQUIREMENTS
Before installing the dryer, be sure the location conforms to local codes and ordinances. In the absence of such
codes or ordinances the location must conform to the National Fuel Gas Code ANSI.Z223.1 LATEST EDITION,
or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91 (Natural
Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.] Gas) or LATEST EDITION (for General Installation
and Gas Plumbing).
1. The dryer must be installed on a sound level floor capable of supporting its weight. Carpeting must be
removed from the floor area that the dryer is to rest on.
IMPORTANT: “The dryer must be installed on noncombustible floors only.”
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
Requirements 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 as noted in this manual (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.
9. The dryer must be installed with a proper exhaust duct connection to the outside.
10. The dryer must be installed with provisions for adequate combustion and make-up air supply.
CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors. Every 6
months, inspect the exhaust ducting and remove any lint build up.

10
C. DRYER ENCLOSURE REQUIREMENTS
Bulkheads and partitions should be made of noncombustible materials and must be located a minimum of
12-inches (30.48 cm) above the dryer’s outer top; 18-inches (45.72 cm) for steam dryers, except along the front
of the dryer which may be closed if desired.
NOTE: Allowances must be made for opening the control door.
X = 12-inch (30.48 cm) minimum, 24-inches (60.96 cm) is suggested for ease of maintenance.
* 1-inch (2.54 cm) maximum for electric dryers.
** 18-inch (45.72 cm) minimum for steam dryers.
NOTE: Air considerations are important for proper and efficient operation.
Dryers may be positioned sidewall to sidewall. However, a 1/16-inch (1.5875 mm) minimum allowance must be
made for opening and closing of the control door and the lint door. It is suggested that the dryer be positioned
about 2 feet (0.61 meters) away from the nearest obstruction for ease of installation, maintenance, and service
(to be measured from the back guard). Refer to the illustration above for details.

11
D. FRESH AIR SUPPLYREQUIREMENTS
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. As a general rule, an unrestricted air entrance from the
outdoors (atmosphere) of a minimum of 1-1/2 square feet (0.14 square meters) is required for each dryer. If
registers or louvers are installed over the openings, then the area must be increased. It is not necessary to have
separate make-up air openings 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 the dryers. The dryer must be
installed with provisions for adequate combustion and make-up air supply.
EXAMPLE: For a bank of eight (8) dryers, two (2) unrestricted openings measuring 2 feet by 3 feet (0.61
meters by 0.91 meters) (6 square feet [0.56 square meters]) is acceptable.
IMPORTANT: Make-up air openings should not be located in an area directly near where exhaust
vents exit the building.
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 cleaning solvent fumes.
Make-up air that is contaminated by dry cleaning solvent fumes will result in
irreparable damage to the motors and other dryer components.
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.

12
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-limit, or lint chamber hi-limit protector thermostat. The dryer must
be installed with a proper exhaust duct connection to the outside.
CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors.
Where possible, it is suggested to provide a separate (single) exhaust duct for each dryer.
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN
CREATE APOTENTIAL FIRE HAZARD.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
The exhaust 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. The shape of the ductwork is not critical so long as the minimum cross
section area is provided. Single or independent dryer venting is recommended.
It is suggested that the use of 90° turns be avoided; use 30° or 45° angles instead.
The ductwork should be smooth inside with no projections from sheet metal screws or other obstructions,
which will collect lint. When adding ducts, the ducts to be added should overlap the duct to which it is connected.
ALL ductwork joints must be taped to prevent moisture and lint from escaping into the building. Additionally,
inspection doors should be installed at strategic points in the exhaust ductwork for periodic inspection and
cleaning.
IMPORTANT: When connecting ductwork to the dryer exhaust duct, be sure that when screws are
used they DO NOT restrict the operation (both opening and closing) of the damper.
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.
To protect the outside end of 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 (i.e., roof or ground level).
IMPORTANT: DO NOT use screens, louvers, or caps on the outside opening of the exhaust
ductwork.
IMPORTANT: Exhaust back pressure measured by a manometer at the dryer exhaust duct area must
be no less than 0 and must not exceed 0.3 inches (0.74 mb) of water column
(W.C.).

13
SINGLE DRYER VENTING
IMPORTANT: For exhaust duct runs over 30 feet (9.14 meters) or if additional elbows are used; a
minimum size of 10-inch (25.4 cm) duct must be used.
HORIZONTAL VENTING
For horizontal single venting, an 8-inch (20.32 cm) minimum duct must be used, the ductwork to the outlet
cannot exceed 30 feet (9.14 meters) refer to Illus. A below. This calculation of 30 feet (9.14 meters) compensates
or allows for the use of a maximum of only one (1) elbow (which is the outside outlet protection).
Illus. A
If the length of the duct run or quantity of elbows used exceeds the above noted specifications, the cross section
area of the ductwork must be increased in proportion to the number of elbows or duct run added.
IMPORTANT: For extended ductwork runs, the cross section area of the duct can only be increased
to an extent. For extended ductwork runs, a professional heating, venting, and air
conditioning (HVAC) firm should be consulted for proper venting information.

14
VERTICAL VENTING
For vertical single venting, a minimum of 10-inch (25.4 cm) venting must be used (refer to Illus. B below). The
ductwork from the dryer to the outside outlet cannot exceed 60 feet (18.29 meters) refer to Illus. B below.
This calculation compensates for the use of a maximum of three (3) elbows including the two (2) elbows
creating the 180° (turned downward) outside outlet.
Illus. B
If the length of the duct run or quantity of elbows used exceeds the above noted specifications, the cross section
area of the ductwork must be increased in proportion to the number of elbows or duct run added.
IMPORTANT:For extended ductwork runs, the cross section area of the duct can only be increased
to an extent. For extended ductwork runs, a professional heating, venting, and air
conditioning (HVAC) firm should be consulted for proper venting information.

15
MULTIPLE DRYER (COMMON) VENTING
If it is not feasible to provide separate exhaust ducts for each dryer, ducts for individual dryers may be channeled
into a common main duct. Each dryer is provided with a back draft damper. The individual ducts should enter
the bottom or side of the main duct at an angle not more than 45° in the direction of the airflow.
The main common duct may be any shape so long as the minimum cross-sectional area is provided. The main
duct should be tapered with the diameter increasing before each individual 8-inch (20.32 cm) duct is added
(refer to Illus. C for Horizontal Venting and Illus. D for Vertical Venting).
IMPORTANT: No more than four (4) dryers maximum should be connected to one (1) main
common duct with a vertical run.
NOTE: Distance between dryer single ducts being connected to the main common duct must be a
minimum of 38-1/4” (97.16 cm) dryer width.
Ductwork should be laid out in such a manner where allowances are made at rear area of the
dryer for removal of rear service panels or guards.
The illustrations on page 16 show the minimum cross section area for multiple dryer venting. These figures
must be increased in proportion if the main duct run from the last dryer to where it exhausts has numerous
elbows or is unusually long.
IMPORTANT: For extended ductwork runs, the cross section area of the duct can only be increased
to an extent. For extended ductwork runs, a professional heating, venting, and air
conditioning (HVAC) firm should be consulted for proper venting information.
Refer to page 16 for Multiple Dryer Horizontal Venting and Vertical Venting examples/illustrations.

16
HORIZONTAL VENTING
Illus. C
VERTICAL VENTING
Illus. D