ok my room 4ftx2 1/2 ft 9 ft high can anybody suggest a fan filter kit cheap as possible please i have only envirolights and at the moment maintain good air flow and extraction with an 8in high speed fan that i vent in my loft i live in a flat 3 storey n have the loft to myself its more the pong im worried about when flowering also is this stuff safe to buy off ebay my local shop bit expencive suppose i could always get it delivered to a diffrent address and im a bit unsure of being ripped off as i am older n wise i trust nobody

The UK420 Growroom Tools should be able to help you, to give you some idea of what you require.

you can make a fillter that'll fit right on any ducting, a design's in the DIY section, or if you follow the link at the top of the screen you'll find fillters there