The other night we could smell something awful like burning hair. Ugh, filled the whole house up with that nasty smell. Next day we took out the blower. It was filled with dust. Vacuumed and used compress air to clean it up. After installing it back in, I noticed that the air coming out of the top of the unit wasn't that much and what was coming out was mostly coming out from the right top, hardly any from the left part of the opening. Both the top and bottom part of the blower fan was rotating. Also, making a bit more noise too. Any ideas what could be the issue?