Which way around are the spray booth concertina filters installed?

Which way around are the spray booth concertina filters installed?

The Procart spray booth concertina paper cardboard filters hold paint whilst allowing a continuation of air flow. This is thanks to the design and placement of holes.When extended, you will notice that there is a hole at the front. The paint is held in the "triangle" and the hole at the back is placed at an angle so that the paint cannot flow through with the air. When you understand how the filter works, then you can see that the hole facing fowards should be at the front. If you have a Procart H or a Procart M with a fibre backing, then the media should be at the back as a secondary filter.

Procart installed in a spray booth