Here is a hood cleaning service from last week on a neglected Los Angeles restaurant exhaust system.
You can see how bad the grease buildup is in the hood right behind the filters.

The inside of the hood was caked with grease behind the filters
After the service there was hardly any grease inside the hood at all.

We cleaned it out pretty well
The kitchen exhaust fan on this exhaust system was also full of grease and was affecting the airflow in the restaurant

Clogged with grease, the fan will not work properly
Airflow restored to this Los Angeles restaurant after cleaning the fan out.

Proper working order restored to the exhaust fan . No more smoke in this Los Angeles restaurant’s kitchen.