Normals direction

Hello everybody,

I have one problem whit the normals surfaces direction...

I made in grasshopper a definition for create a double skin facade system made by lots of sunscreens geometries but I don't know why the surfaces doesn't have the same normals direction...

I need the same normals direction for made the insolation calculation whit ecotec but I don't know hot to fix it...I would like to solve the problem whitout select manually each geometries and flip it...

what I should do?

cheers...