cheers opie exactly the feedback i need.
stealth is of some importance but not 100% if ya know what i mean. im thinkin abouta 4" duct comin from the cab to an inline ducted fan (can i put this in a styrofoam box, 2 keep sound down?) and at you recommendation i think i'll be then routing it through a filter block and then out the window.

if my unit is completely sealed incl the air inlet and im using the carbon filter how effective could i expect my odour control to be? plus any recommendations on fan size given the size of my grow cab and allowing for maybe 6' of ducting, i saw a formula to work it out some where in here but cant remember where.

stay cool all you beautiful ppl

peace out:hippy: