After various problems with Eastern Propane Service, I was fortunate enough to be introduced to the owner of Laconia Oil, a fine gentleman with many years of experience and knowledge. He was able to determine and resolve my furnace problems including issues with the original installation of the power vent. He will be the first one to suggest eliminating the power vent due to future problems and costly repairs. Thanks to him, my past furnace problems have been solved after fighting with a brand new furnace for 3 years. Good Luck!