Not as bad as i expected even if i do have to buy.
http://www.greenshorticulture.co.uk/Grow-room-Products-20/-In-Line-Fans-Fan-Filter-Deals-108/RUCK-Fan-Rhino-Pro-Filter-Packages-1241.asp
I know its a ruck fan but for £129.99 i can get the 4" fan and ducting and rhino filter. Would that fan be ok? Hopefully they will take these 8" back and swap for what i need
Odorsok
http://www.hydraonline.co.uk/index.php?main_page=product_info&cPath=36_34&products_id=283&zenid=36dvdqasaofsrl1p5om8monb21
Smallest one i see is 100 x 300 and there 30 quid each, my 6" one is the third smallest they do so im hoping we you can work it out so we can use that.
These Odorsok Carbon Air Filters are available in VARIOUS Sizes to CHOOSE from:
125mm x 300mm (5 x 12") Flow Rate = 125 Litres per second / Flow Rate = 300 cubic feet per minute
150mm x 400mm (6 x 16") Flow Rate = 160 Litres per second / Flow Rate = 380 cubic feet per minute
200mm x 500mm (8 x 20") Flow Rate = 350 Litres per second / Flow Rate = 850 cubic feet per minute
250mm x 600mm (10 x 24") Flow Rate = 400 Litres per second / Flow Rate = 900 cubic feet per minute
315mm x 800mm (12.5 x 31") Flow Rate = 710 Litres per second / Flow Rate = 1700 cubic feet per minute
350mm x 1000mm (14 x 39") Flow Rate = 1000 Litres per second / Flow Rate = 2400 cubic feet per minute
The Odorsok is a one of kind fabric carbon filter! Thats right FABRIC carbon filter..no metal to weight you down! - It's unlike any other carbon filter on the market and has many benefits over the old heavy metal canister filter.
Developed by a company you have grown to trust in the odour control industry - Phat Filter! The Odorsoks secret is in the unique tri-layer carbon matt & just like the Phat Filter Odorsoks are made only with the highest quality ground virgin activated carbon. Instead of reforming the carbon into dense pallets the carbon goes through two unique -fibre impregnation process -which creates an incredibly absorbent carbon & has 10 times the surface area of many palletized or granular carbon!
Main Features:
LPS Flow Rate = 125 / CFM Flow Rate = 300 The Odorsoks are extremely cost effective. Will provide Odour protection for up to 12 months ! The Odorsok comes completely collapsed in a small box and stores at under 1/12th of it's working size.Helps free up valuable shelf & advertising space. Lightweight, Compact, durable construction Assemble and dis-assemble is easy in less than 2 minutes! Fits all manufacturers fans. Average 8% air loss with centrifugal fans. Works in humidity - just tumble dry when wet. Air flow capacity from 100 - 2400 cf/m. Odorsoks are available in 6, 8, 10, 12 & 14 inch sizes. It's lightweight and compact - weighing just 4lbs. Choice of Airflow direction - Suck or Blow !
How they work
OdorSok air filter removes pollen, odours, vapours, pests, fumes, dust, chemicals and pollutants.
Odor-Sok Air Filters are constructed using bundles of microscopic activated carbon filaments and fibres. By controlling fibre width to 20 nm, the kinetics (adsorption rate) of carbon cloth is similar to that of a single exposed carbon particle. Air flows evenly across the carbon and with accelerated kinetics (up to ID-2400) and increased surface area, Odor-Sok Air Filters retain all the properties of deep filter bed canisters. Faster adsorption rates means smaller filter equipment and up to thirty times less carbon in use for the same result over a one year period.
Attachment of all sizes is as easy as a big zip-strip (available at your local hardware store), and some duck tape. Your exhaust fan inflates the filter!
The Odor Sok can be hung, or wall-mounted depending on the fan (you mount or hang the fan, with the attached sock). For a quiet application, try hanging the fan from a joist with some rubber bungie cords.
Recommended and Maximum CFM:
4" - recommend 133 CFM, max 190
5" - recommend 196 CFM, max 280
6" - recommend 266 CFM, max 380
8" - recommend 595 CFM, max 850
12" - recommend 1190 CFM, max 1700
I just thought I'd add this as its quite useful - STELTHY