American Dryer Corp. AD-310 User manual

ADC Part No. 113110
AD-310 Phase 7
(with Non-Tilting Options)
Installation Manual
For replacement parts, contact the reseller
from which the dryer was purchased or
American Dryer Corporation
88 Currant Road
Fall River A 02720-4781
Telephone: [phone] / Fax: [phone]
E-mail: [e-mail]
042399D G/tcosta
WARNING: For your safety the
information in this manual must be
followed to minimize the risk of fire or
explosion or to prevent property dama e,
personal injury or death.
Do not store or use asoline or other flammable
vapor and liquids in the vicinity of this or any
other appliance.
WHAT DO YOU DO IF YOU SMELL GAS
* Do not try to li ht any appliance.
* Do not touch any electrical switch; do not use
any phone in your buildin .
* Clear the room, buildin or area of all
occupants.
* Immediately call your as supplier from a
nei hbor's phone. Follow the as supplier's
instructions.
* If you cannot reach your as supplier, call the
fire department.
Installation and service must be performed by a
qualified installer, service a ency or the as
supplier.
AVERTISSEMENT: Assurez-vous de bien
suivre les instructions données dans cette
notice pour réduire au minimum le risque
dincendie ou dexplosion ou pour éviter tout
domma e matériel, toute blessure ou la mort.
Ne pas entreposer ni utiliser dessence ni
dautres vapeurs ou liquides inflammables dans
le voisina e de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
* Ne pas tenter dallumer dappareil.
* Ne touchez à aucun interrupteur. Ne pas
vous servir des téléphones se trouvant dans
le bâtiment où vous vous trouvez.
* Évacuez la pièce, le bâtiment ou la zone.
* Appelez immédiatement votre fournisseur de
az depuis un voisin. Suivez les instructions
du fournisseur.
* Si vous ne pouvez rejoindre le fournisseur
de az, appelez le service des incendies.
Linstallation et lentretien doivent être assurés
par un installateur ou un service dentretien
qualifié ou par le fournisseur de az.

Retain This Manual In A Safe 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 e posted near the dryer in a prominent location.
AD-310 Non-Tilting
IMPORTANT NOTE TO PURCHASER
Information must be obtained from your local as supplier on the instructions
to be followed if the user smells as. These instructions must be posted in a
prominent location near the dryer.
FOR YOUR SAFETY
Do not store or use asoline or
other flammable vapors or
liquids in the vicinity of this or
any other appliance.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser dessence
ni dautres vapeurs ou liquides
inflammables dans le voisina e de cet
appareil ou de yout autre appareil.
We have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the right to make
changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change or
discontinue models.
Important
For your convenience, log the following information
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 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 OF ANY EQUIPMENT PER OSHA
(Occupational Safety and Health Administration) 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 NE ER BE LEFT UNATTENDED WHILE IN OPERATION.
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 sh uld the d r switch r 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 perated with any f the back guards, uter t ps, r service
panels rem ved. PERSONAL INJURY OR FIRE COULD RESULT.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed n the equipment and/ r
specified in the installati n manual included with the dryer.
WARNING
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN IN
PLACE, EVEN IF AN EXTERNAL LINT 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. Receivin and Handlin ............................................................................................................... 3
B. Safety Precautions ...................................................................................................................... 4
SECTION II
SPECIFICATIONS/DIMENSIONS AND COMPONENT IDENTIFICATION6
A. Specifications (Gas and Steam) ................................................................................................... 6
B. Dimensions and Component Location ......................................................................................... 7
SECTION III
INSTALLATION PROCEDURES ........................................................................... 9
A. Reassembly Of Dryer ................................................................................................................. 9
B. Location Requirements ............................................................................................................. 14
C. Fresh Air Supply Requirements ................................................................................................. 15
D. Exhaust Requirements ............................................................................................................... 16
E. Compressed Air Supply System ................................................................................................ 22
F. Electrical Information ................................................................................................................ 25
G.. Gas Information ........................................................................................................................ 29
H. Water Supply Connection For Optional Sprinkler System .......................................................... 32
I. Steam Information .................................................................................................................... 33
J. Preoperational Tests ................................................................................................................. 38
K. Preparation For Operation/Start-Up ......................................................................................... 40
L. Shut Down Instructions ............................................................................................................. 41
SECTION IV
SERVICE/PARTS INFORMATION ...................................................................... 42
A. Service ..................................................................................................................................... 42
B. Parts ........................................................................................................................................ 42
SECTION V
WARRANTY INFORMATION .............................................................................. 43
A. Returnin Warranty Card(s) ...................................................................................................... 43
B. Warranty .................................................................................................................................. 43
C. Returnin Warranty Part(s) ........................................................................................................ 43

SECTION VI
ROUTINE MAINTENANCE .................................................................................. 45
A. Cleanin ................................................................................................................................... 45
B. Adjustments ............................................................................................................................. 47
C. Lubrication ............................................................................................................................... 47
SECTION VII
COMPONENT SYSTEM DESCRIPTIONS........................................................ 48
A. Basket (Tumbler) Drive System ................................................................................................. 48
B. Basket (Tumbler) ...................................................................................................................... 49
C. Air Blower Drive System .......................................................................................................... 49
D. Safety Devices .......................................................................................................................... 49
E. Steam Damper Actuator System ............................................................................................... 51
SECTION VIII
BURNER AND BASKET (TUMBLER /LINT CHAMBER MANUAL RESET
HI-LIMIT INSTRUCTIONS ................................................................................... 52
Gas Models Only ........................................................................................................................... 52
Steam Models Only ........................................................................................................................ 53
SECTION IX
DATA LABEL INFORMATION ............................................................................. 54
A. Data Label ............................................................................................................................... 54
SECTION X
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS ....................................................................................................... 56
SECTION XI
PHASE 7 OPL SYSTEM DIAGNOSTICS ........................................................... 58
A. Dia nostic (L.E.D. Display) Fault Messa es .............................................................................. 58
B. I/O Board Input and Output L.E.D. Indicators .......................................................................... 60
SECTION XII
TROUBLESHOOTING ........................................................................................... 65
SECTION XIII
OPTIONAL SPRINKLER SYSTEM COMPONENTS ...................................... 73
Optional Sprinkler Circuit Components ........................................................................................... 73
Sprinkler Option Temperature Controller Settin s ............................................................................ 75

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 basket (tumbler) section of the dryer must be transported and handled in an
upright position at ALLtimes.

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 also may be a fire hazard.

5
7. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaust
ductwork, 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 ductwork can create a potential fire
hazard.
8. For personal safety, the dryer must be electrically grounded in accordance to 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 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 (8.62 bars) 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 FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE
DRYER.
15. For safety, proper operation, and optimum performance, the dryer must not be operated with a load less than
sixty-six percent (66%), 204 lbs. (92.53 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 OF ANY
EQUIPMENT PER OSHA (Occupational Safety and Health Administration)
STANDARDS.

6
SECTION II
SPECIFICATIONS/DIMENSIONS
AND COMPONENT IDENTIFICATION
A. SPECIFICATIONS (GAS AND STEAM)
*Dryers must be provided with a clean, dry, and regulated 80 PSI +/- 10 PSI (5.51 bars +/- 0.68 bars) air supply
(equivalent volume = 9 cfh [0.25 cmh]).
NOTE: ADCreserves the right to make changes in specifications at any time without notice or
obligation.
MAXIMUM CAPACITY (DRY WEIGHT) 310 lbs 141 kg
BASKET (TUMBLER) DIAMETER 62-1/2” 158.75 cm
BASKET (TUMBLER) DEPTH 60” 152.4 cm
BASKET (TUMBLER) VOLUME 106.5 cu. ft. 3.02 cu. m.
DRIVE MOTOR 5 HP 3.73 kw
DOOR OPENING (DIAMETER) 36-3/4” w x 43” h 93.3 cm x 109.2 cm
DOOR STILL HEIGHT - LEVEL 36-1/2” 92.71 cm
COMPRESSED AIR 80 PSI 5.51 bars
COMPRESSED AIR CONNECTION 3/8” F.P.T.
VOLTAGE AVAILABLE 208-600v 3ø3, 4w 50/60 Hz
BLOWER MOTOR 15 HP 11.25 kw
HEAT INPUT 1,125,000 btu/hr 283,500 kcal/hr
APPROX. WEIGHT (UNCRATED) 5,100 lbs 2,314 kg
AIRFLOW 6,500 cfm 184.1 cmm
INLET PIPE SIZE 1-1/2”
VOLTAGE AVAILABLE 208-600v 3ø3, 4w 50/60 Hz
BLOWER MOTOR 25 HP 18.64 kw
APPROX. WEIGHT (UNCRATED) 5,600 lbs 2,540 kg
AIRFLOW 8,500 cfm 240.7 cmm
STEAM CONSUMPTION BOILER HP
NORMAL LOAD
1,153 lbs/hr 524 kg/hr 55
OPERATING STEAM PRESSURE STEAM SUPPLY STEAM RETURN
125 PSI max 8.62 bars 2” 2”
Shaded areas are stated in metric equivalents
Gas*Steam*

7
310
NON-TILT
GAS MODEL
B. DIMENSIONS AND COMPONENT LOCATION

8
310
NON-TILT
STEAM MODEL

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: 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. REASSEMBLYOF DRYER
IMPORTANT: Always keep the basket (tumbler) section of the dryer in an upright position when
moving it.
The dryer may be shipped one (1) of two (2) ways; as a complete unit fully assembled and ready for hookup or
with the basket (tumbler)section separated from the base. If the dryer is shipped in two (2) pieces, the basket
(tumbler) section will have to be lifted onto the base. Use cables through the eyebolts on top of the basket
(tumbler) section, or use a forklift for the lifting process.

10
1. Reassembly Instructions For Gas Dryer Shipped In Two (2) Pieces

11
a. Reassembly Instructions For Non-Tilt Gas Dryers:
Lift the basket (tumbler) section onto the base.
1) The dryer has four (4) support posts assemblies which are located in each corner of the base. On
top of each post assembly is a clevis block which must be bolted to the basket (tumbler) section.
Use the 4-1/2” diameter x 1-1/8” long bolts and lock washers to bolt each clevis block to the basket
(tumbler) section. (Refer to View 1 on the previous page.)
2) Basket (tumbler) power cable reconnection:
a) A plug and cable is located in the right of the base. This must be lifted up and reconnected into
the mating socket located at the bottom of the right basket (tumbler) section.
b) Pull the basket (tumbler) section power cable up from the left side of the base through the hole
in the bottom of the basket (tumbler) section. Reconnect the wires of this cable into the 2-inch
x 4-inch (5.08 cm x 10.16 cm) basket (tumbler) junction box located at the bottom of the basket
(tumbler) section. (Refer to the illustration on the previous page.)
c) Drop the control cable connector from the rear right side of the basket (tumbler) section into the
base. Reconnect the industrial grade plug in to its mating socket.
3) Bolt the 24-inch (60.96 cm) diameter exhaust duct transition piece to the dryers rectangular exhaust
duct. The exhaust duct exits the dryer from the rear of the base. (Refer to the illustrationon the
previous page.) Use the 1/4-20 self drilling screws supplied with the dryer.

12
2. Reassembly Instructions For Steam Dryer Shipped In Two (2) Pieces

13
a. Reassembly Instructions For Non-Tilt Steam Dryers:
Lift the basket (tumbler) section onto the base.
1) The dryer has four (4) support posts assemblies which are located in each corner of the base. On
top of each post assembly is a clevis block which must be bolted to the basket (tumbler) section.
Use the 4-1/2” diameter x 1-1/8” long bolts and lock washers to bolt each clevis block to the basket
(tumbler) section. (Refer to View 1 on the previous page.)
2) Basket (tumbler) power cable reconnection:
a) A plug and cable is located in the right of the base. This must be lifted up and reconnected into
the mating socket located at the bottom of the right basket (tumbler) section.
b) Pull the basket (tumbler) section power cable up from the left side of the base through the hole
in the bottom of the basket (tumbler) section. Reconnect the wires of this cable into the 2-inch
x 4-inch (5.08 cm x 10.16 cm) basket (tumbler) junction box located at the bottom of the basket
(tumbler) section. (Refer to the illustration on the previous page.)
c) Drop the control cable connector from the rear right side of the basket (tumbler) section into the
base. Reconnect the industrial grade plug in to its mating socket.
3) Bolt the 24-inch (60.96 cm) diameter exhaust duct transition piece to the dryers rectangular exhaust
duct. The exhaust duct exits the dryer from the rear of the base. (Refer to the illustrationon the
previous page.) Use the 1/4-20 self drilling screws supplied with the dryer.
4) If a steam dryer is shipped in two (2) pieces, the steam coil may have been removed from the top of
the basket (tumbler) section and shipped with the base. If this is the case, lift the steam coil on to the
top of the basket (tumbler) section with the steam pipe connections facing towards the right side of
the dryer and bolt the coil to the top of the dryer with a 1/4-inch hardware supplied. There are three
(3) panels that cover the front, right side, and rear of the steam coil. Fasten these in position also.

14
B. LOCATION REQUIREMENTS
The non-tilting model dryer requires 18-inches (45.72 cm) of space on each side of the dryer and 24-inches
(60.96 cm) of space behind the unit for ease of service. A minimum of 12-inches (30.48 cm) must be allowed
between the top of a gas dryer and the ceiling. A ceiling height of 120-inches (304.8 cm) is required for gas
dryers, and a ceiling height for 130-inches (330.2 cm) is required for steam dryers. The dryer must be leveled
for proper operation. If shimming is required, put metal shims which are the same size as the base feet under the
base feet. The dryer must be lagged to the floor.
WARNING: Dryer should be located where a minimum length of exhaust duct will be necessary.

15
C. FRESH AIR SUPPLYREQUIREMENTS
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 (make-up air) must be given careful consideration to assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An airflow of 6,500 cfm (cubic feet per minute) 182.2
cmm (cubic meters per minute) must be supplied to each gas dryer and 8,500 cfm (240.7 cmm) for each steam
dryer. As a general rule, an unrestricted air entrance from the outdoors (atmosphere) of a minimum of 6 square
feet (0.56 square meters) is required for each gas dryer and a minimum of 8 square feet (0.74 square meters) for
each steam dryer.
To compensate for the use of registers or louvers used over the openings, this make-up air area must be
increased by approximately thirty-three percent (33%). Make-up air openings should not be located in an area
directly near where exhaust vents exit the building.
It is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are
acceptable. However, they must be set up in such a manner that the make-up air is distributed equally to ALL
the dryers.
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.

16
D. EXHAUST REQUIREMENTS
NOTE: For 1 door dryers, the 24-inch (60.96 cm) diameter exhaust duct exits from the rear of the
base. For 2 door dryers, the 24-inch (60.96 cm) diameter exhaust duct exits from the left side
of the base.
1. General Exhaust Ductwork Information
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, overheating of the
dryer, and shutdown of the burner by the airflow (sail) switches, burner hi-limits, or basket (tumbler) hi-limit
thermostats.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLYSIZED OR INSTALLED EXHAUST DUCTWORK CAN
CREATEAPOTENTIAL FIREHAZARD.
NOTE: THE DRYER MUST BE INDEPENDENTLY EXHAUSTED. COMMON
DUCTWORKIS NOT ACCEPTABLE.
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. Single or independent dryer venting is recommended.
The shape of the ductwork 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 and/or 45º angles instead. The radius of
the elbow should preferably be 1-1/2 times the diameter of the duct.
ALL 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 jointsmust 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 of lint from the ductwork.