I own a Lopi Deerfield that is going on it’s 4 season and has been great. I’ve noticed however that the air coming from the blower doesn’t seem to be coming with as much force, and one those days where I crank up the heat to a higher setting I get much more of a “burn” smell. With that in mind I became aware of a squealing noise that sounds like a bearing that’s failing coming from one of the blower motors (my unit has two blower motors). My question is as a blower motor begins to fail is it normal to have a noticeable loss in volume of air coming thru the unit. Thanks