Whenever ventilation is required in the enclosed compartment and at the same time noise is to be controlled, installing duct silencers or attenuator are the best way to solve the problem. The silencers permit air to flow through while reduce the noise by absorbing it. In selecting a silencer, a balance between noise attenuations and pressure drop need to be considered carefully. By using internally developed software, ISTIQ Noise Control can help to make the right choice quickly and most importantly, accurately.

INTRODUCTION
ISTIQ Duct Silencers are designed to efficiently reduce noise by generator sets, air handling systems, compressor, blower system and all situations requiring air intake and outlet for these equipments to operate. A duct silencer should always positioned in the plant room and if possible as close to the noise source as possible. Normally for a single equipment, two units of duct silencers - intake and discharge is required to effectively reduce the noise to a desired level.

CONSTRUCTION
ISTIQ Duct Silencers consist of a galvanised sheet metal case containing two side panels and one or more splitters. Normal low pressure silencers uses Pittsburgh seams with attached angle frames step welded to the case. Duct sealer is then used to seal to ensure that the silencer is airtight. For high pressure system, the silencer has fully welded seams. The angle frame are protected by a paint finish. Inside the splitters, rockwool or fibre glass is used as sound absorptive infill and is held in the splitters inside a perforated galvanised steel skin. Different acoustic infill is used depending on the application to ensure excellent performance and its effectiveness.

For heavier industrial or marine application, enhanced construction and corrosion resistance are required. ISTIQ Engineers will be glad to discuss and advice your specific needs regarding the design of the structural, aerodynamic and corrosion protection requirement.

FEATURES
ISTIQ Duct Silencers are available in two different models, which basically have two different thicknesses of splitters - 200 mm and 300 mm. The thicker the splitter the better performance at lower frequencies. Each of the models have six length sizes from 900 to 3000 mm. The cross sectional area has no limited size. The performance or the insertion loss of each model is shown in the table 1.

ISTIQ Duct Silencers will be supplied in sections whenever the silencer dimension exceeded 2100W x 2100H x 2100mmL. This will make the transportation and installation easier. The assembly of sectionalized silencers to be done at site.

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