Quote Originally Posted by ThaRaven7
OK, so I'm looking at working with a grow room that measures 8ft x 14ft or 112 ft. sq. Hypothetically, with 32-36 girls in it.
Okie Dokie, I'll play along, Raven

So, according to posts I've read, some people use a 50w per square foot ratio for HID lights, and some use a 62w per square foot ratio. By these two numbers that's 5600-6944w of HID lights. Does this sound reasonable? Accurate? Could I get away with less without greatly reducing yield?

My rule of thumb is 1kw HPS covers abt 4'x4' or 16 sq ft. You have 112 sq ft so that would be 7kw of lights. Sooo... Yes, Yes & NO. But you do need to deduct an aisle space that you don't have to light unless you've mastered the art of human hovering.

Moving on to airflow and odor control. The plan is to buy a large air purifier, moving all exhaust through it on the way out. I've seen several types, including those that use activated carbon. I just want to be sure it's large enough. Please stop me if this is not a good idea. On the opposite side of the room would be fresh air intake. What numbers, in terms of CFMs should I be shooting for the exhaust and intake? Also, what size ducting? 12 in? Larger?

Well you did not give a ceiling hight so calculating volume of the room is difficult. Lets assume 8' high, that would give the room a volume of 896 cu ft. Looking at fans, a 12" should flow 971cfm but with a charcoal filter (which will weigh over 100 lbs) deduct 30% plus losses thru duct work another 20% or so. A 12" fan should be able to turn over room air every 2-3 minutes. That's pretty good. Air intake can be passive. You may want to check out an inline ozone air cleaner, much less restrictive then charcoal can and lighter too.

Any and all help is greatly appreciated.

No problem. One question for you, how you going to cool all those lights? And who's going to pay for it all?