INDUSTRIAL AIR TECHNOLOGY SILENCER User manual

Industrial Air Technology Corp. 1
SILENCER
INSTALLATION, OPERATION
AND MAINTENANCE
MANUAL
P.O. Box 2317, Gaylord, MI 49734 | Phone: [phone] | Fax: [phone] | www.indairtech.com

2 Industrial Air Technology Corp.
1.0 GENERAL INFORMATION
Industrial Air Technology Industrial Silencers are designed
for continuous duty in an industrial environment. They are
engineered for predictable performance and trouble free
operation. Each silencer is thoroughly inspected by trained
factory personnel prior to shipping. When properly installed
and maintained, your silencer will provide many years of
trouble free operation. This manual applies to all Industrial
Air Technology silencers. (Specially engineered silencers for
unique applications may require additional instructions, and
will be included with the silencer.) Read and adhere to the
instructions in this manual and retain for future reference.
2.0 RECEIVING AND INSPECTION
All silencers ship f.o.b. factory. Silencers are prepared
for shipment according to the uniform freight classication
rules of the carriers. The equipment is carefully inspected
and when possible tested before shipment and it is the
responsibility of the carrier that it is in perfect condition upon
arrival. When the carrier accepts a shipment and signs the
bill of lading, it becomes responsible for any subsequent
shortages or damage, evident or concealed, and any claim
must be made against the carrier.
Immediately upon receipt of a shipment, carefully inspect
for damage and shortage. If any damage and/or shortage is
detected or suspected, the carrier must be asked to conduct
an inspection. The consignee’s representative should not
accept shipment without a notation on the delivery receipt
indicating items not delivered or apparent extent of damage.
When a shipment is opened and damage found which was
not evident externally (concealed damage), it is mandatory
that the consignee request an immediate inspection by the
carrier. Promptly le a claim against the nal carrier.
2.1 HANDLING
The silencer should only be lifted by the lifting eyes or
mounting supports. Lifting decisions must be left to trained
personnel.
2.2 STORAGE
Any silencer stored for a period of time must be protected
from dirt and moisture. Use of a tarp to cover the unit will aid
in keeping it clean and dry. Do not use a black plastic tarp, as
it will promote condensation. Preferably, silencers are kept
indoors while in storage and protected from the elements.
3.0 INSTALLATION
Remove the skid, crate, and packing materials carefully. The
silencer and ductwork must be adequately supported; a fan
is not designed to provide support for a silencer. Reference
images below.
In most instances, exible connections are recommended
between the silencer and the fan to avoid loading on the fan
from the weight of the silencer, and transmission of vibration.
Reference image below.
Flexible
Connectors
1.0 General Information
2.0 Receiving and Inspection
2.1 Handling
2.2 Storage
3.0 Installation
4.0 Maintenance
5.0 Troubleshooting
Contents

Industrial Air Technology Corp. 3
Silencers installed in outdoor applications should be
protected from moisture (rain, snow, etc.) entering the
silencer. Moisture can cause long-term damage to the
silencer and a󰀨ect its performance. The use of rain hoods
is recommended. Screens should also be considered to
protect personnel and to keep debris from entering the air
stream. Reference available accessory items below.
Most silencers are designed for a specic airow direction.
All IATC silencers will have a ow arrow applied. For proper
operation, the silencer must be mounted with the direction of
ow arrow in the correct orientation. Reference image below.
Gooseneck
Rain Hood
Rain Hood
Screen
Screen
4.0 MAINTENANCE
To ensure proper operation over its life, a silencer should be
visually inspected at least once a year to verify the following:
o Perforated acoustic internals are undamaged,
remaining parallel and true.
o Airspaces between the acoustic splitters are free of
any debris.
o The holes in the perforated steel are open and free
of dust or other foreign material.
In the event that debris must be cleaned from the airspaces
or the perforated metal, the silencer should be vacuum-
cleaned or wiped clean with a cloth dampened in a mild
detergent solution.
Silencers equipped with drains should have the plugs
removed on a periodic basis to release accumulated water.
PROBLEM POSSIBLE CAUSE SOLUTION
Excessive
pressure
drop
Silencer installed
backwards.
Accumulated debris in the
silencer.
Rain hood causing
excessive pressure drop.
Screen causing excessive
pressure drop.
Re-install the silencer
with its ow direction
arrow in the proper
orientation.
Remove debris and clean
silencer according to
section 4.0.
Re-evaluate rain hood
selection and installation.
Install larger mesh screen
or transition to a larger
screened area.
Excessive
noise
Gaps in ange connections.
Silencer perforations
plugged
Breakout noise through the
ductwork before or after the
silencer.
Noise transmitted through
exible connector between
fan and silencer.
Fan Noise
Silencers are designed for
a specic directivity and
listener location
Use proper gasket
material
Clean according to
section 4.0
Use thicker gage
ductwork.
Insulate ductwork.
Use acoustic exible
connector
Insulate fan housing
Install a sound enclosure
Review the silencer
selection criterion
Excessive
vibration
Silencer supported entirely
by the fan
Install a exible connector
between the fan and
silencer.
Erect a support structure
for the silencer and
ductwork.

4 Industrial Air Technology Corp.
P.O. Box 2317, Gaylord, MI 49734 | Phone: [phone] | Fax: [phone] | www.indairtech.com