Seal flanges for Ultitop covers

In my opinion the Ultitop covers for Ultimaker have a big issue regarding the air circulation. The HEPA filter with its fan has to filter the air which is contaminated with the meleted plastic particle. But in the 2 open regions in the bottom the outside air will be sucted. This make no sense.
To improve I designed 2 seal flanges. One for the left and one for the right.
I tested it since 1 month and I´m very sattisfied with this solution.

Have fun.