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good question.... we have a very large plenum in this building 6-7' and the user is concerned about keeping the air-stream clean. They also have a corp policy about only using ducted returns though...

sorry..i guess a bit more detail would help...

I generally see fan-powered VAV's in a plenum return where the VAV's grab "tempered" plenum air (70F or so) in the heating mode before going through...

Looking to put up a small office building. We are looking at fan-powered VAV's (parallel type) and the tenant is requesting a ducted return.

Question... since fan-powered VAV's grab plenum air...

well, what we are trying to do is calculate the moisture gain from the air entering the air lock open a door is opened. the lab is a controlled environment at 15%RH. The airlock is on the same HVAC...

I'm trying to calculate the air loss through a pressurized vestibule/air-lock when the door opens.

I've come up with a couple calculations but do not have a high degree of confidence in either. ...