Noise Criteria: Noise levels in all 8 octave bands due to equipment and duct systems shall not exceed following NC levels: TYPE OF ROOM NC LEVEL Bathrooms and Toilet Rooms 40 Conference Rooms 35 Locker Rooms 45 Offices, Large Open 40 Offices, Small Private 35 Shops 50 Warehouse 50 For equipment which has no sound power ratings scheduled on the plans, the contractor shall select equipment such that the foregoing noise criteria, local ordinance noise levels, and OSHA requirements are not exceeded. Selection procedure shall be in accordance with ASHRAE Fundamentals Handbook, Chapter 8, Sound and Vibration. An allowance, not to exceed 5 dB, may be added to the measured value to compensate for the variation of the room attenuating effect between room test condition prior to occupancy and design condition after occupancy which may include the addition of sound absorbing material, such as, furniture. This allowance may not be taken after occupancy. The room attenuating effect is defined as the difference between sound power level emitted to room and sound pressure level in room. In absence of specified measurement requirements, measure equipment noise levels three feet from equipment and at an elevation of maximum noise generation. //Seismic Restraint Requirements: SPEC WRITER NOTE: Brace equipment in accordance with Seismic Design Categories B, C, D, E, and F and Importance Factor as defined in ASCE 7. Brace ductwork and piping in accordance with the above guidelines as well as the Seismic Hazard Level as found in the SMACNA Seismic Restraint Manual.
Noise Criteria: Noise levels in all 8 octave bands due to equipment and duct systems shall not exceed following NC levels: TYPE OF ROOM NC LEVEL Bathrooms and Toilet Rooms 40 Conference Rooms 35 Locker Rooms 45 Offices, Large Open 40 Offices, Small Private 35 Shops 50 Warehouse 50 For equipment which has no sound power ratings scheduled on the plans, the contractor shall select equipment such that the foregoing noise criteria, local ordinance noise levels, and OSHA requirements are not exceeded. Selection procedure shall be in accordance with ASHRAE Fundamentals Handbook, Chapter 8, Sound and Vibration. An allowance, not to exceed 5 dB, may be added to the measured value to compensate for the variation of the room attenuating effect between room test condition prior to occupancy and design condition after occupancy which may include the addition of sound absorbing material, such as, furniture. This allowance may not be taken after occupancy. The room attenuating effect is defined as the difference between sound power level emitted to room and sound pressure level in room. In absence of specified measurement requirements, measure equipment noise levels three feet from equipment and at an elevation of maximum noise generation. //Seismic Restraint Requirements: SPEC WRITER NOTE: Brace equipment in accordance with Seismic Design Categories B, C, D, E, and F and Importance Factor as defined in ASCE 7. Brace ductwork and piping in accordance with the above guidelines as well as the Seismic Hazard Level as found in the SMACNA Seismic Restraint Manual.
230551.docx