The lady told me she was not happy with her company.

[cgibson]

I was called out to this place. It was cleaned in May by another company but she told me she had a "feeling" that they did not do a good job.
I had the same "feeling" when I removed the filter and looked up.

 

[dodsonish]

All that build up must be from the filter not being properly installed.

Is the shot down the duct from an access panel?