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Thanks for the reply's guys. I think i will go with the 125mm extractor fan with filter set up, would i get away with 2 4" holes with this size of fan? I would like to keep the holes down to a minimum, Im also guessing ill need PVC elbows for the passive intake holes, will 90 degree ones be ok?

Hey Guys. I've just put my grow box together, the size is 3x3x7 and i will be using 175w of CFL's for Veg and 400w HPS for flowering and the inside is covered with panda film. The problem I'm having is i dont know what size my passive intake should be and what size my exhaust fan should be...