You’ll probably need an acoustics consultant to analyze the Sound Transmission Class (STC) requirements. Hire one early in the design stage to avoid the need for later redesign. If the mechanical engineer is comfortable running the necessary calculations

You’ll probably need an acoustics consultant to analyze the Sound Transmission Class (STC) requirements. Hire one early in the design stage to avoid the need for later redesign. If the mechanical engineer is comfortable running the necessary calculations for HVAC system background noise level, the acoustics consultant may only be required for assistance and final verification. If the mechanical engineer is willing to run the HVAC background noise calculations, you will want to include this in their scope of work.