You have a surburban furnace in your coach. THe furnace has an outer can, which the furnace slides into. You will have to disconnect the air delivery lines, propane line, electrical and then slide the furnace out of the housing. This design is much superior to attwood. It's a couple hour job, the bearings are in the electrical motor, the motor is not that expensive, I would just replace the motor Problem solved. Live with the noise unless you are not going to use the coach for around a month. I would order the motor directly from suburban, they have excellent customer survice, so once it's on order you should have it in a week. If you want me to order it I could but then I would have to drop ship it to you. You can PM me and let me know, my company is a warranty provider for suburban.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech