Hello, has anyone ever upgraded the blowers on the american harvest 6100 or know if you can? i am not getting enough air out of my vents ( barely feel it) it has 2 500 cfm blowers on it which is probably quite a bit less then our oil furnace ( i dont know the blower size on that one). does anyone have any ideas? I was planning on trying to install a duct booster fan closer to the main supply duct to get more air to push through.