Attached is a picture of my Kitchen Exhaust Vent on my 2015 Forest River Sunseeker GTS. I recently purchased the motorhome and upon my first cooking effort, we got a lot of smoke in the home. Upon further investigation part of the problem is the external cover for the vent is closed. There are two knobs that are probably the locks for the cover. I not sure what direction to move the knobs. They are plastic and I am fearful of breaking them. It doesn't appear the vent has ever been opened. Suggestion for properly opening this vent is appreciated.