American Dryer Corp. ML-96HS User manual

ADC Part No. 113053
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]
120298JEV/cj
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.
ML-96HS
Installation Manual

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.
Theillustrationson the following pages may not depict your particular dryer exactly. The illustrations are a composite of the
various dryer models. Be sure to check the descriptions of the parts thoroughly before ordering.
DATE OF PURCHASE MODEL NO.
DISTRIBUTORS NAME
Serial Number(s)
ML-96 HS
“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:

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 DRYERS.
WARNING
CHILDREN SHOULD BESUPERVISED IF NEAR DRYERS 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 and operator's manual included with the dryer.
Dryers mustnotbe 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 ........................................................................................................ 2
A. RECEIVING and HANDLING.................................................................................................. 2
B. SAFETY PRECAUTIONS ........................................................................................................ 3
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION................................................................. 5
A. SPECIFICATIONS .................................................................................................................... 5
B. COMPONENT IDENTIFICATION ........................................................................................... 7
SECTION III
INSTALLATION PROCEDURES ..................................................................................................... 9
A. LOCATION REQUIREMENTS ................................................................................................ 9
B. UNPACKING/SETTING UP .................................................................................................. 10
C. DRYER ENCLOSURE REQUIREMENTS ............................................................................. 12
D. FRESH AIR SUPPLY .............................................................................................................. 13
E. EXHAUST REQUIREMENTS ............................................................................................... 14
F. ELECTRICAL INFORMATION.............................................................................................. 18
G. GAS INFORMATION ............................................................................................................. 21
H. PREPARATION FOR OPERATION/START-UP ..................................................................... 24
I. PREOPERATIONAL TESTS ................................................................................................... 25
J. OPERATING INSTRUCTIONS............................................................................................... 26
K. SHUT DOWN INSTRUCTIONS ............................................................................................ 27
SECTION IV
SERVICE/PARTS INFORMATION................................................................................................ 28
A. SERVICE................................................................................................................................. 28
B. PARTS ..................................................................................................................................... 28
SECTION V
WARRANTY INFORMATION ....................................................................................................... 29
A. RETURNING WARRANTY CARDS ..................................................................................... 29
B. PARTS ..................................................................................................................................... 29
C. RETURNING WARRANTY PARTS ....................................................................................... 29
SECTION VI
ROUTINE MAINTENANCE........................................................................................................... 31
A. CLEANING ............................................................................................................................ 31
B. ADJUSTMENTS ..................................................................................................................... 32
C. LUBRICATIONS .................................................................................................................... 32
SECTION VII
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS ................................................................................................................................ 33

2
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 or 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.

3
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 or 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. Dryers 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.
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.

4
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 CAN/CGA-B149.2-M91 (L.P. Gas) or
LATEST EDITION (for GENERAL INSTALLATION and GAS PLUMBING) or CANADIAN
ELECTRICAL CODES PARTS 1 & 2 CSA C22.1-1990 or LATEST EDITION (for ELECTRICAL
CONNECTIONS).
NOTE:Failure to do so will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer drawer 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. READ and FOLLOWALL CAUTIONandDIRECTION LABELSATTACHEDTOTHEDRYER.
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.

5
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION
A. SPECIFICATIONS
IMPORTANT: Dryer must be supplied with clean, dry and regulated air pressure at 80 psi ± 10 psi
(5.5 bar +/- 69 bar).
NOTE:ADCreserves the right to make changes in specifications at any time, without notice or
obligation.
GAS
MAXIMUM CAPACITY (DRYWEIGHT)95 lbs. 43.1 kg
BASKET (TUMBLER) DIAMETER 42" 106.7 cm
BASKET (TUMBLER) DEPTH 29-1/4" 74.3 cm
BASKET (TUMBLER) MOTOR 1/2 HP .373 kw
BLOWER MOTOR 3 HP 2.238 kw
DOOR OPENING (DIAMETER)30-3/4" 78.1 cm
BASKET (TUMBLER) VOLUME 23.5 cu. ft. .67cu.m.
DRYERS PER 20'/40'' CONTAINER 10/20
DRYERS PER 45'/48' TRUCK 24/24
VOLTAGE AVAILABLE 208-460v / 3ø / 3, 4w / 50/60 Hz
APPROX. WEIGHT(UNCRATED)878 lbs. 453.6 kg
APPROX. WEIGHT(CRATED)1,000 lbs. 544.3 kg
HEAT INPUT 350,000 btu/hr 88,199 kcal/hr
AIRFLOW 2,700 cfm 76.5 cmm
INLET PIPE CONNECTION* 1" ---
COMPRESSED AIR VOLUME 4 cfh .12 cmh
COMPRESSED AIR CONNECTION 1/8" F.P.T. ---
Shaded areas are stated in metric equivalents
*Size of piping varies with installation conditions.

6
NOTE:ADCreserves the right to make changes in specifications at any time, without notice or
obligation.

7
B. COMPONENT IDENTIFICATION
1. Dryer Front View
Illus. No. Description
1Microprocessor Control/Keyboard Panel Assembly (controls)
2Control (Top Access) Door Assembly
3Main Door Assembly
4Lint Panel Assembly
5Lint Door
6Wire Diagram (located behind Control Door)
7Top Console (Module) Assembly

8
Illus. No. Description
1Electrical Service Connections
2Top Console
3Heating Unit
4Relay/Wiring Box
5Data Label and Installation Label
6Air Connection
7Exhaust Transition Piece
8Optional Exhaust Damper Assembly - if damper option was purchased at time dryer order was
placed, the damper must be installed at the time of dryer
installation. If damper option was purchased, the damper is
shipped inside the dryer tumbler (basket)
2. Dryer Rear View

9
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: National Fuel
Gas Code ANSI.Z223.1-LATEST EDITION or National Electric Code ANSI/NFPA NO. 70-LATEST
EDITION, or in CANADA, the installation must conform to applicable CANADIAN STANDARDS: CAN/
CGA-B149.1-M91 (Natural Gas).
A. 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. 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 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
B. 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.
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) 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.
To increase bearing life and improve efficiency, the dryer should be tilted slightly to the rear.
The ML-96 is not provided with a back draft damper. The damper is available as a "cost" option. If this damper
option was purchased, for shipping purposes, the 16" (40.64) butterfly damper assembly is shipped in the tumbler
(basket) of the dryer. For assembly of this damper assembly (refer to the illustration on page 8).

11
1. Leveling Dryer
To level dryer, place 4-inch square metal shims (refer to the illustration on page 10) or other suitable material
under the base pads. It is suggested that the dryer be tilted slightly to the rear. If more headroom is needed
when moving dryer into position, the top console (module) may be removed.
a. To remove top console (module).
NOTE: DO NOT have power connected when separating the top console.
1) Disconnect the ground wire at the rear of dryer.
2) Remove the six (6) sets of nuts and washers (B) holding the console (module) to base. (Located with-
in control boxes)
3) Open control door and control panel then disconnect the following:
(a) On the right side box, disconnect the 4-pin and 2-pin plug. Also remove the air connection at the
union.
(b) On the left side box, disconnect the drive and blower motor wires, along with the two (2) "red" and
"black" wires.
4) Lift the console (module) off of the dryer base.
IMPORTANT:The dryer must be transported and handled in an upright position at all times.

12
C. DRYER ENCLOSURE REQUIREMENTS
Even though a 30-inch clearance is acceptable, it is recommended that the rear of the dryer be positioned
approximately two (3) feet (36-inches) from nearest obstruction (i.e. wall) for ease of installation, maintenance
and service. Bulkheads and partitionsshould be made from noncombustible materials. The clearance between
the bulkhead header and the dryermust be a minimum of 4 inches and must not extend more than 4 inches to the
rear of the dryer front. The bulkhead facing must not be closed in all the way to the top of the dryer. A 2-inch
clearance is required.
NOTE:Bulkhead facing should not be installed until after dryer is in place. Ceiling area must be located a
minimum of 12 inches above the top of the dryer.
NOTE:When fire sprinkler systems are located above the dryers, a minimum of 18-inches above the dryer
console (module) is suggested. Dryers may be positioned side wall to side wall however, 1 or 2
inches is suggested between dryers (or wall) for ease of installation and maintenance. Allowances
must be made for the opening and closing of the control and lint doors.

13
D. FRESH AIR SUPPLY
When the dryer is operating, it draws in room air, heats it, passes this air through the basket (tumbler), and
exhausts it out of the building. Therefore, the room airmust be continually replenished from the outdoors. If the
make-up air is inadequate, drying time and drying efficiency will be adversely affected. Ignition problems and sail
switch "fluttering" problems may result, as well as premature motor failure from overheating.
Air supply (makeup air) must be given careful consideration to assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An air flow of 2,700 cfm (cubic feet per minute)must be
supplied to each dryer. As a general rule, an unrestricted air entrance from the outdoors (atmosphere) of a
minimum of 3 square feet is required for each dryer.
To compensate for the use of registers or louvers used over the openings, this makeup air must be increased by
approximately thirty-three percent (33%). Makeup air openings should not be located in an area directly near
where exhaust vents exit the building.
It is not necessary to have a separate makeup air opening for each dryer. Common makeup air openings are
acceptable. However, they must be set up in such a manner that the makeup air is distributed equally to ALL
the dryers.
EXAMPLE: For a bank of six (6) dryers, two (2) unrestricted openings measuring 3 feet by 3 feet (18
square feet) 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:Makeup 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.

14
E. EXHAUST REQUIREMENTS
1. General Exhaust Duct Work Information
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, overheating of the
dryer, and shutdown of the burner by the airflow (sail) switches, burner hi-limits, or basket (tumbler) hi-heat
thermostats.
CAUTION:DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION:IMPROPERLY SIZED OR INSTALLED EXHAUSTDUCT WORKCAN
CREATE APOTENTIAL FIREHAZARD.
NOTE:When a dryer is exhausted separately, it is recommended that a back draft damper be installed.
NOTE:When dryers are exhausted into multiple (common) exhaust lines, 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 twenty
(20) feet. In the case of multiple (common) dryer venting, the distance from the last dryer to the outside
exhaust outlet should not exceed twenty (20) feet. The shape of the duct work is not critical so long as the
minimum cross section area is provided. It is suggested that the use of 90º turns in ducting be avoided; use
30º or 45º angles instead. The radius of the elbows should preferably be 1-1/2 times the diameter of the
duct. Excluding basket or dryer elbow connection in the exhaust duct run. If more than two (2) elbows are
used, the cross section area of the duct work must be increased in proportion to the number of elbows
added.
ALL duct work should be smooth inside with no projections from the 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. Inspection doors 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 at each basket duct area should
not exceed .3 inches of water column (W.C.).
IMPORTANT:Where the exhaust duct work 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.
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. If 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. In either case, allow at least twice the diameter of the duct between the duct opening
and the nearest obstruction.

15
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. It is suggested that the use of 90° turns in the ducting be avoided; use 30° 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 16-inches for a round duct or 14.25-inches for a square
duct. Duct size must not be reduced anywhere down stream of dryer.
IMPORTANT:Exhaust back pressure measured by a manometer at each basket (tumbler) exhaust
duct area should not exceed 0.3 inches of water column (W.C.).
It is suggested that the duct work from each dryer be a minimum of 16-inches for horizontal runs with no
more than one (1) elbow and 18-inches for vertical runs with no more than 3 elbows without exceeding
twenty (20) feet (excluding dryer connections and outside exhaust outlets). If the duct exceeds twenty (20)
feet or has numerous elbows, the cross section area of the duct work must be increased in proportion to the
length and number of elbows in it. In calculating duct size, the cross section area of a square or rectangular
duct must be increased by twenty (20) percent for each additional twenty (20) feet. The diameter of a
round exhaust duct should be increased ten (10) percent for each additional fifteen (15) feet. Each 90º
elbow is equivalent to an additional thirty-six (36) feet, and each 45º elbow is equivalent to an additional
eighteen (18) feet.
IMPORTANT:DO NOT use screens or caps on the outside of opening of exhaust duct work.

16
IMPORTANT:For extended duct work runs, the cross section area of the duct work can only be
increased to an extent. Maximum proportional duct work runs cannot exceed twenty
(20) feet more than the original limitations of twenty (20) feet with one (1) elbow for
horizontal runs and three (3) elbows for vertical runs. When the duct work approaches
the maximum limits as noted in this manual, a professional heating, venting and air
conditioning (HVAC) firm should be consulted for proper venting information.
ALL 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 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. Inspection doors should be installed at strategic points in the exhaust duct
work for periodic inspection and clean-out of lint from the duct work.
NOTE:Where 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.
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. If 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. In 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 opening of exhaust duct work.
3. Multiple Dryer (common) Venting
If it is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers may be
channeled into a "common main duct." The individual ducts should enter the bottom or side of the main duct
at an angle not more than 45º in the direction of air flow and should be spaced at least 46-inches apart.
The main duct should be tapered, with the diameter increasing before each individual duct (16-inch
minimum) is added.
IMPORTANT: The ML-96 is not provided with a back draft damper unless the damper option was
purchased. When exhausted into a multiple (common) exhaust line, a back draft damper
must be installed at each dryer duct.
IMPORTANT: No more than three (3) dryers should be connected to main common duct.
The main duct may be any shape so long as the minimum cross sect is provided. The illustration on page 17
shows the minimum cross section area for multiple dryer round or square venting. These figures must be
increased 10 square inches when rectangular main ducting is used, and the ration of duct width to depth
should not be greater than 3-1/2 to 1. These figures must be increased in proportion if the main duct run
from the last dryer to where it exhausts to the outdoors is unusually long (over twenty [20] feet) or has
numerous (more than two [2] elbows in it). In calculating duct work size, the cross section area of a square
or rectangular duct must be increased twenty percent (20%) for each additional twenty (20) feet. The
diameter of a round exhaust must be increased ten percent (10%) for each additional twenty (20) feet.
Each 90º elbow is equivalent to an additional thirty-six (36) feet and each 45º elbow is equivalent to an
additional fifteen (18) feet.