York HIC4008B21S Engineering Manual page 29

4-WAY CASSETTE
(H,Y,C)IC4030B21S (H,Y,C)IC4036B21S
(H,Y,C)IC4048B21S
NOTE:
Operation sound is equivalent to an anechoic chamber (free space).
Noise level will be increased by the surrounding noise and echoes.
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TC-17005-rev.1