I add air at the back of my bench. this assists the air going out, as well as reduces the amount of make up air I need. that way my air stays more conditioned to the temp I need. I also adjust my furnace damper to bring in air from outside and heat it/condition it.
a fan in a duct pushing air from far away, coming up, at the back of my bench, toward my exhaust.
one important note-
I always suggest making sure you are not creating negative pressure in your house. MAKE sure your furnace exhaust is not being pulled into the home. AND do not have candles lit when your exhaust fan is on.
(smoldering can happen)
and! If your fan is pulling 600 cfm.
your room is 3,200 cubic feet (like mine)
every 5.5 min. all of the air is going to leave the room.
The rest of the home is 12000 CF ...so, It will take approx. 20 min.
before my fan starts pulling onto the furnace exhaust.
hm....interesting to think about huh?
So...if you add air at the back of the bench, it gives you more time to condition your air.
Okay, who am I to know this? after auto cad drawing and working with engineeres for 10 years
on science lab systems...
and keep it safe and HOT!