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� r � A 1%6 'OF /'\ )0 Ralph Hahn and Associates Mr. Lynn Williams Building & Grounds Indian River County 1840 25th Street Vero Beach, Florida Dear Mr. Williams: Superintendent 32960 July 22, 1982 Re: Indian River County Courthouse Investigation HVAC, Vero Beach, FL RHA #kM82-553A On Thursday, July 15th, 1982, I visited the County Courthouse at your request to examine several areas of the HVAC systems where complaints of noise or thermal comfort had been reported. The second floor courtrooms were examined first. You stated that these rooms had been plagued by noise problems since the remodelling was completed about a year ago, but that you knew of no temperature or com- fort complaints. After starting up the system in one of the courtrooms, the following observations were made: a. The air handling unit (AHU) serving the court- room is not unnecessarily loud for a unit of its size, however, some equipment noise is radiated through the lay -in acoustical ceiling suspended below. b. Four supply diffusers are served from this AHU. The last two diffusers (most remote from the AHU) did not appear to project any objectionable noise. The second closest diffuser to the AHU projects some air noise but it is located in the high ceiling and may not be objectionable with normal background noise. The diffuser closest to the AHU is located in the low ceiling and trans- mits both air and equipment noise. c. Noise is also noted from the return air grilles located in the back of the room close to the AHU. We understand that previous attempts to alleviate the problem included new branch ductwork to channel some of the supply air into the lobby and the addition of a sound trap or traps._ These modifications have helped to attenuate much of the noise, however a further reduction is desired. The supply and return ductwork is externally insulated, thus leaving unlined sheet metal to readily transmit the noise. 58 AUG 4 1982 � a� 5 HU_E X09