Furnace Blower Motor is a replacement part for the following suburban furnace models: SF-35/ SF-35F. Furnace Motor; For Suburban Furnace SF-35/ SF-35F. 12V DC Fan Motor for Suburban SF Series Furnaces. Replaces old motor number 231707. Suburban SF-35/ SF-35F Furnaces. All orders placed on Fridays will arrive the following Monday/Tuesday depending on location or. Thank you for your business.