American Dryer Corp. AD-30 (Export) Administrator Guide

ADC Part No. 112121
SUPER AD-30
Installation/Operator's 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: [email protected]
102397
012999WM/mt
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.

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 toADC at [phone] or telephone your orders directly to the ADCPartsDepartmentat
[phone]. Please specify the dryermodelnumber andserialnumberin addition to thedescription andpartnumber,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 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.
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.
OBSERVEALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation/operator's manual
included with the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
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:
SUPER AD-30

IMPORTANT
YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS
SUPPLY or THE STEAM SUPPLY BEFORE ANY COVERS or GUARDS ARE
REMOVEDFROMTHEMACHINETOALLOWACCESS FORCLEANING,ADJUST-
ING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational
Safety and Health Administration) STANDARDS.
CHILDREN SHOULD NOTBEALLOWED TO PLAY ON OR NEAR THE DRYER(S).
WARNING
CHILDREN SHOULD BESUPERVISED IF NEAR DRYER(S) IN OPERATION.
DRYER(S) SHOULD NEVER 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: Lordesopérationsd’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 OBSERVEALLSAFETY PRECAUTIONS displayed on the equipment and/or
specified in the installation/operator's manual included with the dryer.
Dryer(s) must not be installed or stored in an area where it will be exposed to water and/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. RECEIVING and HANDLING ....................................................................................................... 3
B. SAFETY PRECAUTIONS.............................................................................................................. 4
SECTION II
SUPER AD-30 SPECIFICATIONS.................................................................................................... 6
SECTION III
INSTALLATION PROCEDURES ..................................................................................................... 8
A. UNPACKING/SETTING UP .......................................................................................................... 8
B. LOCATION REQUIREMENTS ...................................................................................................... 9
C. DRYER ENCLOSURE REQUIREMENTS ................................................................................... 10
D. FRESH AIR SUPPLY .....................................................................................................................11
E. EXHAUST REQUIREMENTS ..................................................................................................... 12
F. ELECTRICAL INFORMATION................................................................................................... 18
G. GAS INFORMATION .................................................................................................................. 24
H. STEAM PIPING INFORMATION ............................................................................................... 28
I. PREPARATION FOR OPERATION............................................................................................. 32
J. PREOPERATIONAL TESTS ........................................................................................................ 33
K. PREOPERATIONAL INSTRUCTIONS ....................................................................................... 35
L. SHUT DOWN INSTRUCTIONS ................................................................................................. 38
SECTION IV
SERVICE/PARTS INFORMATION................................................................................................ 39
A. SERVICE ...................................................................................................................................... 39
B. PARTS ........................................................................................................................................... 39
SECTION V
WARRANTY INFORMATION ....................................................................................................... 40
A. RETURNING WARRANTY CARD(S)......................................................................................... 40
B. WARRANTY ................................................................................................................................ 40
C. RETURNING WARRANTY PARTS ............................................................................................. 40
SECTION VI
ROUTINE MAINTENANCE........................................................................................................... 42
A. CLEANING .................................................................................................................................. 42
B. ADJUSTMENTS ........................................................................................................................... 43
C. LUBRICATION ............................................................................................................................ 43

SECTION VII
TROUBLESHOOTING.................................................................................................................... 44
MICROPROCESSOR (COMPUTER) MODELS ............................................................................... 44
DUAL TIMER MODELS .................................................................................................................... 50
GAS MODELS ............................................................................................................................. 51
ELECTRIC MODELS ................................................................................................................... 51
STEAM MODELS ........................................................................................................................ 51
SECTION VIII
REVERSING TIMER SPIN/DWELL ADJUSTMENTS .............................................................. 54
SECTION IX
TECHNICAL INFORMATION....................................................................................................... 55
SECTION X
PROCEDURE FOR FUNCTIONAL CHECK OF
REPLACEMENT COMONENTS ................................................................................................... 57

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. 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 theADC Traffic Manager at [phone].
IMPORTANT:The tumbler section of 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 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 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,
wax.
EXPLOSION COULD RESULT.
WARNING:DO NOT dry mop heads. Contamination by wax or flammable solvents will create a fire
hazard.

5
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 also may be a fire hazard.
7. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaust duct
work, and inside 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 Electric 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 switches, lint door switch, 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 drying and cooling cycles have been completed can
create a fire hazard.
12. DO NOT operate steam dryers with more than 125 PSI steam pressure. Excessive steam pressure can
damage steam coil and/or harm personnel.
13. Replace leaking flexible hoses or other steam fixtures immediately. DO NOT operate the dryer with leaking
flexible hoses. PERSONAL INJURY MAY RESULT.
14. READ and FOLLOWALLCAUTIONandDIRECTIONLABELSATTACHEDTO THEDRYER.
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 per
OSHA (Occupational Safety and Health Administration) STANDARDS.

6
SECTION II
SUPER AD-30 SPECIFICATIONS
A. SPECIFICATIONS
*Specifications noted are for 60 Hertz dryer models ONLY.
** Specifications noted are for 50 Hertz dryer models ONLY.
*** 36 Kw oven size is available in 60 Hertz and 50 Hertz models.
Gas
Electric
Steam
MAXIMUM CAPACITY (DRYWEIGHT)30 lbs. 13.62 kg
BASKET (TUMBLER)DIAMETER 30" 76.2 cm
BASKET (TUMBLER)DEPTH 30" 76.2 cm
BASKET (TUMBLER)MOTOR 1 HP * 0.746 kw*
3/4 HP* 0.560 kw**
DOOR OPENING (DIAMETER)21-1/2" 54.61 cm
BASKET(TUMBLER)VOLUME 12.27 cu.ft. 0.347 cu.m.
APPROX. WEIGHT (UNCRATED)475 lbs. 215.65 kg.
APPROX. WEIGHT (CRATED)525 lbs. 238.35 kg
DRYERS PER 20'/40' TRUCK 12/28
DRYERS PER 45'/48' TRUCK 30/32
VOLTAGE AVAILABLE 120-230v 1ø 208-575v 3ø 50/60 Hz
HEAT INPUT 175,000 btu/hr*44,1000 kcal/hr*
146,000 btu/hr** 36,792 kcal/hr**
AIRFLOW 850 cfm* 24 cmm**
700 cfm** 19.8 cmm**
INLET SIZE 3/4" N.P.T.
EXHAUST DUCT OULET 10" Dia. 25.4 cm
VOLTAGE AVAILABLE 208-460v 3ø 50/60 Hz
OVEN SIZE
KW btu/hr kcal/hr
30** 102,459 ** 25,820 **
36*** 122,950 *** 30,983 ***
40** 136,612 ** 34,426 **
42* 143,442 * 36,142 *
48* 163,934 * 41,311 *
APPLIED VOLTAGE/PHASE/APPROX. AMP DRAW**
KW 208/3Ø 240/3Ø 380/3Ø 400/3Ø 416/3Ø 430/3Ø
60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz
30 88 --- --- 78 --- 49 --- --- --- 45 41 ---
36 105 --- 92 92 --- 58 --- 55 --- 53 48 ---
40 116 --- --- 102 --- 64 --- 61 --- 59 53 ---
42 122 --- 106 --- --- 67 --- --- --- 61 56 ---
44 --- --- --- --- --- --- --- 67 --- --- --- ---
48 138 --- 121 --- --- 76 --- --- --- 70 63 ---
VOLTAGE AVAILABLE 120-230v 1ø 208-575v 3ø 50/60 Hz
HEAT INPUT 5.8 Bhp
STEAM CONSUMPTION 200 lbs/hr 98.7 kg/hr
INLET SIZE (SUPPLY)1"
OUTLET SIZE (RETURN)1"
OPERATING STEAM PRESSURE 125 psi 8.79 kg/sq cm
80 PSI COMPRESSED AIR 1/8" N.P.T.
NOTE:ADCreserves the right to make changes in specifications at any time without notice or
obligation.

7
SUPER AD-30
Specifications
NOTE:ADCreserves 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 with 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)
and/or
ANSI/NFPA NO. 70-LATEST EDITION (National Electric 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 (L.P. Gas) or LATEST EDITION (for
GENERAL INSTALLATION and GAS PLUMBING)
and/or
CANADIAN ELECTRICAL CODES PARTS 1 & 2 CSA C22.1-1990 or LATEST EDITION
(for ELECTRICAL CONNECTIONS).
A. UNPACKING/SETTING UP
Remove protective shipping material (i.e., plastic wrap, and/or optional shipping box) from dryer.
NOTE:For models 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, and or any small sharp object.
IMPORTANT:Dryer must be transported and handled in an upright 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 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.
The basket (tumbler) is supported during shipping by a wooden block. REMOVE THIS BLOCK BEFORE
STARTING THE DRYER.
IMPORTANT:For microprocessor (computer) models, this wooden block must be removed before
connecting power to the dryer or irreparable damage to the basket (tumbler) will
result.
The lint coops of ALL SUPER AD-30 dryers are supported during shipping by a bracket. REMOVE THIS
BRACKET BEFORE STARTING THE DRYER.

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 with the National Fuel Gas Code ANSI.Z223.1-
LATEST EDITION, or in CANADA, the Canadian Installation Codes CAN/CGA-B149.1-M91 (Natural Gas)
or CAN/CGA-B149.2-M91 (L.P. Gas) or LATEST EDITION.
1. The dryer must be installed on a sound level floor capable of supporting its weight. It 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. Provisions for adequate air supply must be provided as noted in this manual (refer to Fresh Air Supply in
Section D
4. Clearance provisions must be made from combustible construction as noted in this manual (refer to Dryer
Enclosure Requirements in Section C).
5. 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).
6. Dryer must be exhausted to the outdoors (refer to Exhaust Requirements in Section E).
7. Dryer must be located in an area where correct exhaust venting can be achieved as noted in the manual
(refer to Exhaust Requirements in Section E).
IMPORTANT:Dryer should be located where a minimum amount of exhaust duct will be necessary.

10
Dryers may be positioned side wall to side wall. However, a 1/16" 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 two (2)
feet away from the nearest obstruction for ease of installation, maintenance, and service (to be measured from
the back guard.) (Refer to the illustration on page 11 for details.)
NOTE:Air considerations are important for proper and efficient operation.
C. DRYER ENCLOSURE REQUIREMENTS
Bulkheads and partitions should be made of noncombustible materials and must be located a minimum of 12-
inches (18-inches or more is recommended for ease of installation, maintenance, and service) above the dryer
outer top, except along the front of the dryer which may be partially closed in if desired. The clearance between
the bulkhead header and the dryer must be a minimum of 4-inches and must not extend more than 4-inches to
the rear of the front. The bulkhead facing must not be closed in all the way to the top of the dryer. A 1-inch
clearance is required.
NOTE: Allowances must be made for opening the control door.

11
D. FRESH AIR SUPPLY
The SUPER AD-30 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 is required for each dryer. If
registers or louvers are installed over the openings, then the areamust be increased. It is not necessary to have
a 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.
EXAMPLE:For a bank of four (8) dryers, two (2) unrestricted openings measuring 2 feet by
3 feet (6 square feet) 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 motors and other dryer components.
NOTE:Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.

12
E. EXHAUST REQUIREMENTS
Exhaust duct work should be designed and installed by a qualified professional. Improperly sized duct work 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-heat protector thermostat.
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUSTDUCT WORKCAN
CREATE APOTENTIAL FIREHAZARD.
CAUTION:DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
The exhaust 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. The shape of the duct work 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° and/or 45° angles instead.
The duct work 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
duct work 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 duct work for periodic inspection and
cleaning.
IMPORTANT:When connecting duct work 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 duct passes through a wall, ceiling, or roof made of combustible materials,
the opening must be 2-inches larger (all the way around) than the duct. The duct must be
centered within this opening.
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. If the duct work travels vertically up through the roof, itshould 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 or caps on the outside of opening of exhaust duct work.
IMPORTANT:Exhaust back pressure measured by a manometer at the dryer exhaust duct area must
not exceed 0.3 inches of water column.

13
SINGLE DRYER VENTING
IMPORTANT:For exhaust runs over 10 feet a minimum duct size of 10-inches must be used.
HORIZONTAL VENTING
When single 10-inch venting is used, the duct work from the dryer to the outside outlet cannot exceed 30 feet
(refer to Illus. A below). This calculation of 30 feet compensates or allows for the use of a maximum of only
one (1) elbow.
Illus. A

14
If the length of the duct run or quantity of elbows used exceeds the above noted specifications, the cross section
area of the duct work must be increased in proportion to the number of elbows or duct run added.
IMPORTANT: For extended duct work runs, the cross section area of the duct can only be increased
to an extent. For extended duct work runs, a professional HVAC firm should be
consulted for proper venting information.
VERTICAL VENTING
When vertical single venting is used minimum duct size is 12-inches (refer to Illus. B below), the duct work from
the dryer to the outside outletcannot exceed 60 feet (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

15
MULTIPLE DRYER (Common) VENTING
HORIZONTAL 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. No more than four
(4) dryers should be connected to one (1) main common duct run.
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 10-inch duct is added (refer to Illus.
Cand Illus. D).
Illus. C
Horizontal venting must not exceed 20 feet - this calculation compensates for the use of a maximum of only
one (1) elbow which is the outside outlet protection.
NOTE:Distance between dryer single ducts being connected to the main common duct must be a
minimum of 31-3/8" (dryer width).
Duct work 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.

16
Illus. C (refer to the previous page {page 15}) shows the minimum cross-section area for horizontal 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 duct work runs, the cross-section area of the duct can only be increased
to an extent. For extended duct work runs, a professional HVAC firm should be
consulted for proper venting information.
The maximum length of venting from the last dryer to where it exhausts...
Vertical venting must not exceed 25 feet - this calculation compensates for the use of a maximum of three (3)
elbows including the two (2) elbows creating the 180º (turned down
ward) outside outlet protection.
IMPORTANT:No more thanfour (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 31-3/8" (dryer width).
Duct work 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.
Illus. D shows the minimum cross-section area for vertical 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 duct work runs, the cross-section area of the duct can only be increased
to an extent. For extended duct work runs, a professional HVAC firm should be
consulted for proper venting information.
VERTICAL VENTING
ILLUS. D