I have read on this forum that the Carrier Infinity can reduce flow down to a minimum of 275 CFM/ton during cooling. I am getting a 5 ton Infinity 16 heat pump. Does this mean 275 CFM * 5 tons = 1375 CFM or 275 CFM * 3 tons (low stage) = 825 CFM is the lowest possible flow rate? I am curious because I am getting all new ducts and a 4 zone system and I am concerned about noisy ducts when one zone is calling.

Also what is the highest ESP that is acceptable when only one zone is calling?

[Edited by eberrong on 10-25-2006 at 12:25 PM]