AT&T EG46 Fox Hollow Road & Amazon Road Page 2 <br />Predicted Equipment Sound Levels <br /> <br />24-Hour Operation Equipment <br />The equipment will be located in an equipment room served by two Marviar air conditioning units. <br />According to manufacturer data, the Marvair AVP36 air-conditioning which each produce 70 dB(A) <br />at 5 feet. The combined noise level from both units is 73 dBA at 5 feet. <br /> <br />To predict equipment noise levels at the receiving properties, this survey uses the methods <br />established by ASHRAE and AHRI Standard 275-2010. Application factors such as location, <br />height, and reflective surfaces, and noise reduction from intervening elements are accounted for <br />in predicting the sound level at the receiving properties. <br /> <br />The nearest receiving property line is approximately 113 feet West of the equipment and 129 feet <br />South of the equipment. The predicted sound level at the nearest property line is shown in the <br />table below. <br /> <br /> Table 1 <br />Application Factors and Predicted Noise Levels <br />Proposed New Equipment <br />Line Application Factor W S <br />Equipment Sound Pressure Level at 5 ft., L 73 <br />1 73 <br />PS <br />Building Edge Reduction <br />2 -5 <br />Distance Factor (DF) -27 -28 <br />3 <br />DF = 20 log(D/D) <br />(113 ft) (129 ft) <br />1012 <br />4 New Equipment Sound Pressure Level at Receiver, L 41 45 <br />PR <br /> <br />As shown in the table, the predicted sound pressure level from the proposed equipment at the <br />nearest receiving properties will meet the 45 dBA code limit. <br /> <br />Please contact us if you have any questions or require further information. <br /> <br />Sincerely, <br />SSA Acoustics, LLP <br /> <br /> <br /> <br /> <br />Alan Burt, P.E. <br />AP <br />SSOCIATE ARTNER <br /> <br />AC <br />COUSTICAL ONSULTANT <br /> <br /> <br /> <br /> <br /> <br /> <br />