On March 14, 2023 at 10:15, highfigh said...
Any transitions for the HVAC ducts connected to the new space should be flexible- the transmission along steel is extremely efficient and it travels very fast. In addition to the flexible transitions, baffles made of rigid, sound absorbing duct material will help to block some of the remaining sound in the ducts.
When possible, don't allow straight duct connections between the air handler and a room or between rooms. Insert a bend and baffle along the way. This will decrease efficiency and must be incorporated in the overall design, but it will significantly reduce noise transmission. Yes, this will increase costs, and if the extra trouble makes the aircon contractor too grumpy, try to change contractors.
