Can't get louvers in my DXF

Hello all, this will be my first time using this forum and I have what I hope will be a simple question.  Also, please note that I am not a mechanical engineer by trade and the only experience I have with Solidworks is a 4 day introductory course and what I have taught myself.

I need to send the attached drawing to my fabricator and when I do I send him a dxf to make his life easier.  However, when saving as a dxf the louvers I have on my piece are eliminated.  Why is this happening and can I fix it?

I would appreciate any assistance you could provide.

Thanks.

SolidworksSheet Metal