I'm having a second hand smoke problems in a 2000 sqr ft bar. The builiding has a standard residential heating / AC unit installed. My question is what is the best strategy for make up air / and or clean air? I've talked to a few contractors about it, and I get different answers. I just want to make sure I do the right thing before I start. My options are:
1. Ceiilng hung smoke eater.
2. HRV w/ CO2 detector. This should suck air from the ceiling and supply fresh air to floor mounted returns
3. Similar system as #2 w/o the HRV. (two fans, CO2 sensor)
There is no other make up air in the building, however, it is a old construction with lots of leaks and two bathroom fans.
My Manual J suggested that I needed about 700 - 900CFM of make up air, which I believe should be dependent on CO2 levels. (which should change as people leave and enter the establishment)
I was quoted a 525CFM HRV by Fantech. It seems that this unit and two bathroom fans should make up about 700 CFM. However, the efficency of this unit is 55%. Is it smarter to get a slightly bigger unit and run it slower to get more effiency? Or is 55% even worth it? A lot of the residential HRVs hit 70% efficency.
Thanks in advance!