Assertion: sound attenuator | /r/HasProperty | substituted for equal length of standard duct
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Source sentences:
text: Because these employ a substitution technique — the sound attenuator is substituted for an equal length of standard duct — we can have reasonably precise values for dynamic insertion losses, airflow-generated noises and airflow static pressure losses (see 2015 ASHRAE Handbook chapter 48 for deviation and confidence results based on round-robin testing).