â???â?� : ventilating a C-24 close t: (-) pressure and how it benefits

I have decided to grow in a C-24 cab and figured Iâ??d start with the components of a closet first and then once I get the closet I can set everything up in it. So far I completed my DIY carbon scrubber and am currently going to wire my DIY cool tube, just have to drill a hole through the reducer/inducer for the connections, and am in the process of finding a cheap/er can-fan and I wanted to know:

-Can a blower be used in the same fashion as a can-fan regardless of CFM rating?

-Anything other than e-bay, that I can go to , to physically see a cheaper fan
*( NYC by the way)

*my scrubber is about 14� in length, 6 x 4 inducer/reducer, ¼� batting on inside around core and a layer on the outside so I have about 1- 1/4� of activated charcoal in there now, giving me about 10 or so inches of filtering space.

-What amount of CFM fan do I need to pull through the scrubber, past the bulb, past the ballast and to out take? With say about 9-10 feet of vent coil tubing.

-How many plants can fit in one of these C-24 cabs?

* I plan to seal the closet with weather stripping to create the negative pressure I have been reading about?

-What are the benefits if any of negative pressure environments for the plants?

Ofcourse all responses are appreciated, I am the same here as I am at the other sites I have subscribed to. This question has been posted elsewhere to get the maximum information possible. My name is the same as well at the other sites I speak of.

Cheap price for a can fan is Plantlightinghydroponics.com.A 4"vortex fan for $110.00 .The best I have found.In NY you will find some hydroponic store,
just look in the phone book.Whats the wattages of the bulb?How big of a closet ,how are you cooling and heating it?
Peace

*running a 400 watt cool tube,

*closets apprximately 48" long x 72" high x 21" wide

*closet will be AC cooled and room temp heated thermostat is in the room where the closet will be