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Okay guys I'll right down if I have any questions else. Thanks for your help ;)

Sorry for so many questions guys, first time grower here ;) I'm just being afraid that 170cfm fan won't be enough to cool down 400w hps in vertical grow, or shouldn't be I be afraid? And how many fans do I actually need? 1 for cooling down the bulb and that's enough? I would need another one in...

I think that fan would be fine for vertical grow, if not I'll have to buy something else as well. So I just cut back from this cord and connect those cables to that fan? http://www.nix.ru/autocatalog/cables/384_2254_draft_large.jpg

So what do you guys think about this http://www.e-senukai.lt/santechnika-sildymas-vedinimas/oxid-12/istraukiamieji-buitiniai-ventiliatoriai/buitiniai-ortakiniai-ventiliatoriai/kanalinis-ventiliatorius-vents-150vko_2.html ? Should I be alright with 170cfm fan?

Well maybe this fan will be alright? It's about 170CFM. How do I suppose to wire it up? http://www.e-senukai.lt//kanalinis-ventiliatorius-vents-150vko_2.html

I will be running just open light. My room dimensions are 2x3x7, I will be placing fan under the bulb, shouldn't that booster fan supposed to be more powerful than 4 inch 160crm? Or am I mistaken?

Do you guys think this 12 inch 50watt fan will be any good for vertical 400w grow? thanks :) http://pigu.lt/ventiliatoriai/ventiliatorius_kyt_30bwh_equation?id=4146983

Do you guys think this 12 inch 50watt fan will be any good for vertical 400w grow? thanks :) http://pigu.lt/ventiliatoriai/ventiliatorius_kyt_30bwh_equation?id=4146983

Do you guys think this 12 inch 50watt fan will be any good for vertical 400w grow? thanks :) http://pigu.lt/ventiliatoriai/ventiliatorius_kyt_30bwh_equation?id=4146983

So this http://www.ebay.co.uk/itm/Plug-in-Hydroponics-Grow-Light-Fan-Speed-Controller-/130842299637?pt=UK_HomeGarden_Garden_PlantsSeedsBulbs_JN&hash=item1e76cf0cf5 & this...

So this http://www.ebay.co.uk/itm/Plug-in-Hydroponics-Grow-Light-Fan-Speed-Controller-/130842299637?pt=UK_HomeGarden_Garden_PlantsSeedsBulbs_JN&hash=item1e76cf0cf5 & this...

Those panasonics are too damn pricey in Europe.

Do I need to have an exhaust fan or I can just make a holes for example in my grow tent/room/closet? That should be fine, right?

I need a fan that will not only push out air but be able to absorb it, as I heard it's important to refresh air in grow box, am I right? So this fan should then be okay ...

So will it be enough to have this fan to fully ventilate 4x4 grow tent? http://www.ebay.co.uk/itm/4-Hydropon...EM&refid=store As I understood it can push air in & out, is that correct? Or only out? Thanks I'l be using 400w hps btw.

So will it be enough to have this fan to fully ventilate 4x4 grow tent? http://www.ebay.co.uk/itm/4-Hydropon...EM&refid=store As I understood it can push air in & out, is that correct? Or only out? Thanks I'm going to use 400w hps bulb btw.

So will it be enough to have this fan to fully ventilate 4x4 grow tent? http://www.ebay.co.uk/itm/4-Hydroponic-Grow-Room-Fan-Inline-Tent-TT-Extractor-For-Duct-Carbon-Filter-/221233778407?ssPageName=STORE:HTMLBUILDER:SIMPLEITEM&refid=store As I understood it can push air in & out, is that...

Start from weed already :)

I also think it would be better to get MH bulb for veg, right?

The only thing I bought locally so far is 400HPS bulb + ballast. Ordered from internet PH,ppm, temp meters. I will be buying pots tomorrow. I need your guys recommendations on which fans to get? Please recommend some cheap but strong fans, thanks :) And about nutrients, is it only about numbers...