Air duct design & noise reduction
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boxes, stick 50mm thick sagging sponge or other sound absorption material to form silencing
static pressure box or return air box, for substantial reduction of noise at unit air delivery
port/exhaust;
(2) Note: Ceiling space accommodating the unit is itself a large static pressure box. If material
of ceiling cover plate is mineral wool or other sound absorbing material, equipment room
walls are brick masonry instead of glass, and wall tightness is good, noise radiated by unit
casing will be greatly reduced;
(3) Design correct and reasonable silencing straight tube, branch tube, elbow or air port (for
particular type selection, reference manufacturer product samples);
(4) Increase thickness of air duct wall and wrap ultra-fine glass wool (or other sound
absorbing material) of suitable thickness on exterior of air duct;
(5) Due to limited sound absorption performance of traditional galvanized air duct and
fiberglass reinforced plastics air duct, stretching metal (non-metal) flexible hose, polyurethane
composite air duct, super air duct and other new type of sound absorption/thermal insulating
air duct can be considered.
III. How to avoid poor cooling/heating effect
(1) Carry out correct type selection;
(2) To extend pipeline, add freon to requirement by manual.
(3) For higher user requirement on heating, unit with auxiliary electric heating is
recommended.
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