FIELD: venting systems, particularly noise-reduction of industrial ventilation and conditioning systems.
SUBSTANCE: air duct includes a number of box-like sections connected with each other by locking devices. The sections are made of light-weight sound-absorbing structures having perforated linings and facings filled with sound-absorbing filler. The filler is made of sound-absorbing materials. Facings and linings have perforation factor of not less than 0.25. Sound-absorbing filler thickness is within optimal range, namely within 20-50 mm. Covering is made of stainless steel or galvanized sheet with 0.7 mm thickness and has polymeric protective-and-decorative coating having thickness depending on coating type. Covering may be also made of aluminum sheet of 1.0 mm thickness and may be covered with 25 μm coating.
EFFECT: decreased aerodynamic and structural noise, simplified assembling and disassembling and increased comfort in rooms.
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|---|---|---|---|
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|
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