Hello all. I recently installed a Harman PF 100 and scrapped my oil burner. So far I'm happy with the heat output, but we haven't had any real cold weather yet. I noticed that when there is just a little demand for heat, the PF 100 will continually feed pellets but takes a real long time (if ever) to get the distribution blower to come on. (low set point 100 degrees per the manual). It's acting like a pilot light, but I'd rather not burn any pellets if the dist. blower isn't going to come on in say 10 minutes tops. When there is a demand for heat the thing goes like a jet engine and the distr. blower comes on quickly. Any ideas? Here are some particulars... feed rate to 3 burning Energex Premium grade. The manual says 4, but I noticed a few un-burned pellets. 7' of vent pipe 1-90 deg., 1-45 deg. homemade outside air: 3" galv. exiting furnace to 3"alum. flex-duct to 4" galv. to 4"diameter screen vent. I will probably change-out the 3" alum. flex to galv. pipe because it probably creates too much resistance in the 20' run. Other things that I've noticed... t-stat not even close the combustion blower goes on a long time. I thought the outside air pipe would fix that. the little flapper in the door sometimes flaps like crazy. I think if I switch to a smooth wall outside air pipe this will be eliminated.