Cleaning a kitchen vent hood
We have a kitchen venthood with 2 wiremesh filters, which we put in the dishwasher periodically, and try to degrease the visible area around the inside of the hood. The vent goes up into the attic and ends at the fan motor that vents to the outside. It makes a couple of 45 degree turns on its way up. The entire distance is about 20-25 feet.
Question: This setup is about 25 years old. It still works fine. But we worry about grease build up and possible fire hazard. Is this a serious risk, or do the filters catch most of the grease and does our cleaning the visible area inside the vent remove the rest?
I would appreciate input from someone who has had their vent cleaned. How messy a job is it? How do we find someone who is competent to service the vent?