also the straighter you can keep your exhaust hose the stronger it will pull. the set up shown here is seriously underpowered to remove any fumes from plastic let alone lead which its particulates are much heavier than plastic. if he had moved the exhaust fan over closer to the hole in the wall it would help but anything under 500 cfm is a headache waiting to happen from the fumes even if you see teh majority going up the fan its the ones you dont see that will hurt you