The filter lives inside that top yellow barrel, above the funnel. If you look at the junction of the yellow barrel (below the black motor cowl) and the yellow funnel you’ll see a silver band clamp. That allows the entire top end to be lifted off the funnel, and the filter is exposed. It’s a very compact design. 

Ryan/// ~sigh~ I blew up another bowl. Moke told me "I made the inside bigger than the outside".