Air Noise
High speed in a channel or diffuser usually create airborne noise. In the turbulence of the flow in a duct and an excessive fall in pressure in the duct and diffuser system also creates noise. The noise of the most obvious directly under the diffuser. Room background levels NC 35 and less give little masking effect. Any noise source is above the background level and is easily detected.
As a rule, air, noise can be reduced by using the following procedures:
- Restriction branch duct speeds of 1200 fpm
- Limitation of static pressure in branch ducts adjacent to sales points $ 0.15. water
- Sizes diffusers work at the output of jet speeds up to 1200 fpm (neck speed is limited to 500 to 900 ft / min), and total pressure 0.10 century water
- By using several small diffusers and the return of the lattice) instead of one or two large outlets or carts that have a higher power of the sound
- Ensuring low noise dampers in the branch duct, where a pressure drop of more than 0.20. water should be taken
- The inside lining of drainage canals, near the fan in a quiet this noise source
- Design background noise levels in the room to be at least NC 35 or 40 NC
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Industrial