[https://www.dw.com/en/germany-hamburg-issued-a-smoke-warning-as-large-fires-rage/a-65265945](https://www.dw.com/en/germany-hamburg-issued-a-smoke-warning-as-large-fires-rage/a-65265945)
In light of this, I guess I have to close my vent as well?
But I am not sure how to do it.
I have moved the knob at the bottom to the left and right which is the only thing I can move but I can feel the chilled air from outside in both cases if I put my hand next to it.
This is my vent. [https://i.redd.it/heai9vef3usa1.jpg](https://i.redd.it/heai9vef3usa1.jpg)
Any ideas how do I close it?