carbon filter

Which out of these three carbon filter/fan combos would be recommended?

These are on ebay:
4" INLINE FAN CARBON FILTER COMBO ODOR CONTROL SCRUBBER - eBay (item 370401592360 end time Jul-03-10 10:34:04 PDT)

4" INLINE FAN CARBON FILTER COMBO ODOR (UL) APPOVOVED! - eBay (item 170481794670 end time Jul-03-10 08:49:47 PDT)

4" INLINE FAN CARBON FILTER COMBO ODOR CONTROL SCRUBBER - eBay (item 120516796991 end time Jul-10-10 14:59:19 PDT)

How many pounds of carbon should be looked for in a filter?

Which out of the three would be the better fan?

Is ducting necessary to connect the fan to the filter for these? Or can they be connected together as is?

Thanks

too much for shipping, look for HTG Supply on ebay, I got the same 4"fan and scrubber for 125 free shipping. Look around for free shipping, itsout there

#2 just inst practical you need something to hold the scrubber up, bungee cords probably.
#3 HTG supply rocks

You first need to know whether you're sizing a fan just for odor control or for temperature control as well. Look at the ventilation section of the grow room tutorial in my signature.

jesus of Cannabis said:

too much for shipping, look for HTG Supply on ebay, I got the same 4"fan and scrubber for 125 free shipping. Look around for free shipping, itsout there

#2 just inst practical you need something to hold the scrubber up, bungee cords probably.
#3 HTG supply rocks

Click to expand...

Who would argue with Jesus. I'm not even christian and I'd listen

I agree HTG is da bomb! I got their 400W HPS/MH interchangable light for under $200. I grew my last crop {AK-48F) under 200W t-5s and it took nearly 3 months in veg and another 4 months to ripen. And this light was the same price. (Anyone wnt to buy a four bulb, four ft. light? LOL) My latest crop, (Aurora Indica and Blue Mystic) have been sprouted for 3 weeks and are already a foot tall. I will be topping them tomorrow to do my first attempt at a SCROG

Thanks for the replies. For those who have experience with the 4" fan/filter from HTG, how is the loudness from it? Would a speed controller be needed for it? The fan/filter is for a closet that is about 320 cubic feet for odor control.