KS I ISO 7235:2020 Acoustics — Laboratory measurement procedures for ducted silencers and air-terminal units — Insertion loss,flow noise and total pressure loss
2020KS I ISO 7235:2020 Acoustics — Laboratory measurement procedures for ducted silencers and air-terminal units — Insertion loss,flow noise and total pressure loss
2014KS I ISO 7235:2014 Acoustics — Laboratory measurement procedures for ducted silencers and air-terminal units — Insertion loss, flow noise and total pressure loss
2004KS I ISO 7235:2004 Measurement procedures for ducted silencers-Insertion loss, flow noise and total pressure loss