I have a 1996 Ruud single stage gas furnace at our lake home and wonder if there is a replacement ECM blower that can be retrofitted? The furnace is in the 90% area and exhausts with PVC. I do not have the model and size right now( we live about 2 hours away). We had the ECM in a previous home and liked the quiet noise level and efficiencies when leaving the furnace fan in the ON position to keep air moving. Thank you in advance for any input.