Carbon Scrubber Question for Upbeat Surviving Cancer Patient

Right off I have to apologies for the title, I never talk about my illness, but no one knows me here, I need to ask a question and wanted to get someone’s attention asap. I am in a lot of pain and new to pot smoking, oh, and I am 50 years old. I want to grow two plants, which should be enough for me. I don’t want my neighbors (who are friends) to know what I am doing. I bought a tent and have some female seeds. My tent is 3x3x6.5 and I thought I’d get one of these fans, as I am concerned about noise.

http://www.sears.com/shc/s/p_10153_12605_SPM5694860603P?ci_sku=SPM5694860603&ci_src=14110944&i_cntr=1317527391342&sid=IDx20101019x00001a

In case that link does not work it is an Acme Miami AM-125 5 inch mixed flow in-line Fan - 162 CFM (they are not supposed to make a lot of noise). From what I have read, 162 CFM should be enough to cover 3x3x6.5, please correct me if I am wrong (my grow light is 250 hps). The problem I am having is this fan’s diameter is 5” and I can’t seem to find a 5” carbon scrubber anywhere. I would try to make one but how do I know that the DIY will have a 162CFM rating to match my fan. I’ve been searching for a week and I don’t know what to do, so I leave this question to you. Please offer me some advice if you have any to spare.
Kind regards,
Celticseas57

hey, there are replacement tops for carbon scrubbers in various sizes. I don't know any other website that sells em but heres a link
http://canadianwholesalehydroponics.com/products.cfm?cat_id=17&show_products=1&catpage=2

I just bought a 1000 watt system from them so they are legit, and their prices are hard to beat.

Although checking they seem to only have 6" in the dropdown box. If you e-mail them I'm sure they will have them though. At least you know what you're looking for.

Alternatively you can use a reducer in reverse to what ever size you want.