In order to control noise levels originating from air conditioning apparatus sound liners are used. They are fitted inside ducts. Liner comes in air flow path. Sound liner material is fiberglass. Continuous air flow may damage liner facing. It is mixed with incoming air and spread in the conditioned space. When inhaled this material may cause allergies and other health related problems. Moist fiberglass liner is a breeding ground for growth of microorganisms. Their concentration in air circulation areas increases which degrades indoor air quality.
Fiberglass material may be lined with metallic or plastic sheets. It reduces bad effects of fiberglass spread. But effectiveness of the liner reduces with use of solid facing. Perforated facings are effective in this case, but it can trap moisture too. Fiberglass lining may be avoided by sizing duct at reduced velocity. Discharge velocity from unit exit can be reduced by use of plenums. This will increase duct area. Increased areas result in to low noise. Low velocity air travels in the main ducts. Main ducts are oversized. These occupy more space in ceiling void. But increasing size of the duct solves noise issues without use of fiberglass material.
Some tough materials are also available as duct liners. These don’t mix with air and provide smooth surfaces. Moisture carryover is reduced by using eliminators. With less moisture in the air, fiberglass when installed has long life. Fiberglass liners are also treated with special materials which retard microbial growth. This is also helpful in long life of fiberglass material.
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