Radiant Ceiling Panels

Steel Ceilings

Johnstown, OH 中的 商业制造与供应
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From energy efficient AIRTITE Radiant Ceiling Systems, to aesthetically pleasing architectural metal ceilings, to tamper-resistant security ceilings, …

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问:
What is NRC?
答:
NRC means Noise Reduction Coefficient. It is the average sound absorption coefficient measured at four frequencies: 250, 500, 1,000, and 2,000 Hz expressed to...
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