I've been asked by one of my top three customers, to provide ventilation for a brand new underground golf cart garage. (The ramp is a former swimming pool!)
The golf carts are electric, not gas. At this point, I wish they were gas.
There is a battery charger for each one of these 150 36VDC...
http://www.accaconference.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=ACCOA&Category_Code=SDC
Manual "Q", I believe, is just what you're searching for. Manual "T" is also an excellent reference, if you're not super experienced in dust design.
HVAC-talk is the place to take this question, but, I'm going to give you a headsup that the answer that you're goiong to receive there is to have a licensed contractor perform a load calculation on your home.
Every building is different, and the design conditions differ GREATLY between South...