I upgraded (?!) my Ashby's Diamondback to a 500psi machine from a company in Texas and though the cleaning pressure is great, the machine has no provision for an exhaust. The Diamondback was a joy in this respect as the smell from solvent spotters, moisture and a fair amount of noise was blasted straight outdoors usually thru the letterbox but a window would do just as well.
Just wondering how many chaps use an exhaust with their porty? I work in London so a TM is completely out of the question...