It seems i have fallen to the BS of your typical hydro store!
Basically i was sold a 4 way spigot which is interconnected to my 4 fans via 100mm ducting. The spigot has another 8" space for my fan, which was going to be extracted outdoors. But even though i discussed problems arising from smell, it wasn't until i opened the boxes and realised from the design that they will be pumping out some blatant aroma, whcih the hydro store neglected to explain. Okay, so i should i have known but being a bit of a stoner and being a complete novice i had no idea! So, when i realised my downfall i called them up and they told me 'yeh, there's something called an in line carbon filter with an in/out plus it works as a muffler and it's the dogs bol...'.
I thought i could smell some BS drifting via the telephone cable and out of the speaker hence my question on here.
How could i filter the smell from the air being pumped out from the hoods?