I learned something today about blower fans , I got a blower fan off a demo job and it would shut down after 10 minutes , then after cooling down restart and run for another 10 minutes and repeat that cycle —–was talking with a HAV friend and he told me that I need a baffle to put some back pressure on the fan , said it would pull more amps with no restriction , so I looked around the yard for some sheet metal and found this aluminum plate with a hole cut out of it , bungie corded the plate in front the fan , it fit perfect and it stopped the shut down problem , it ran for 2 hours yesterday evening without shutting down , it also increased the air flow speed ———-I wonder how many people have trashed their blower boxes for the same reason