The blower on the furnace seems to be a key element, then you need to have it consistently oiled so that nothing wears out or is harmd.
The blower belt can be worn and you can sustain some injury with use.
It is an pressing, high-priced part of the system that must be treated with love. Why am I telling you this? I didn’t treat my blower with respect. I procrastinated and never called for Terrell furnace service. I figured if my furnace turns on, then it is nice to go. The most I did was change an air filter. It consistently turned on so I figured all was well. Then my furnace started making noises when operating. It was a horrible screeching, squeaking sound every time. It was impossible to sleep, work, or exercise with that racket. I then realized that my minor cleaning duties weren’t going to service it. My furnace never magically fixed itself either. I called the Terrel furnace service provider and the guy was legitimately aggravated with the condition of my blower. There were worn parts, frayed belts, and all sorts of debris on it. The harm was extensive, he said. He also told me that I needed to substitute the entire blower and the belt affixed to it. It was such a hefty repair. I legitimately debated on getting a whole new heater. When you factor in the price tag and what you get, it was a smarter choice to substitute. I chose service though since the thought of starting fresh was disheartening.