Boolean Assistance Please!

New Hydrovent 8-29-16.blend (581 KB)

Hello there! This is my first post and I am in need of some assistance. I am new to blender (less than 2 years) and I am stuck on trying to use the Boolean function on the attached file. I have 6 segments I am trying to cut through the main model but when I try using difference the model disappears. I tried solidifying the model at 0.00002 first then the Boolean but ended with the same result. Any assistance here would be greatly appreciated!!!

Look at the objects you are trying to cut out. See how they are a darker colour grey that the main object. Turn on the normal display in edit mode and you’ll see they have inconsistent normals. In this case what is inside and what is outside ? Who knows, blender doesn’t

Select all the faces and recalculate the normals with Ctrl+N.

Then use the boolean

Thank you very much, that did it!