Centrotherm Eco Systems’ InnoFlue polypropylene flue gas vent systems are now approved by Amana/Goodman on its 90%-plus high-efficiency condensing furnaces. InnoFlue is the first UL-1738- and ULC-S636-approved polymeric venting option for Amana/Goodman customers. Beginning May 1, 2013, DOE has mandated 30 Northern states enforce a minimum AFUE rating of 90% on gas furnaces. Amana/Goodman approval provides its installers an option to reuse existing B-vent flues in combination with InnoFlue Flex. This option eliminates the need to remove and reroute the exhaust.