I think I am going to run an experiment on current draw. I posted here some current figures that others said were not correct and have since had nearly exact corroboration of those figures from another system I had no hand in putting together, in fact his were slightly lower so to some extent I feel vindicated. I have a feeling that the 6" inlet on the 1800 fan housing is a choke point for the 15" fan and if the 15" impeller were put in a Max housing I would see a rise in current draw due to the 8" inlet which means that the 16" fan could use a bigger inlet also. For the Max I always recommend that the system be built with an open 6" duct to atmosphere to scrub the air at all times as well as the duct to the machine. To me running an 8" main down to one 6" duct is not a good idea at all and it is clearly impossible to run 8" to a machine so why not scrub the air, every little bit helps.
Last edited by Chris Parks; 02-15-2012 at 10:05 PM.
Everything I like is either illegal, immoral or fattening