Just as a point of reference regarding use of MaxxAir vent covers instead of Fan-Tastic vent covers: MaxxAir vent covers are everywhere and I've always used them - even over my Fan-Tastic roof fan. However, I'm on my 2nd MaxxAire vent cover (white) in the rear and my 3rd MaxxAire vent cover (white) in the front. All replacements have been free because of MaxxAir's superb warranty service -> replacements have been shipped to me immediately with no questions asked, no receipts needed, and the shipping was free.
My white MaxxAir vent covers have developed small cracks around the mounting holes where the bolts go through - I don't know if the black material would do the same. Those of you who have white MaxxAir vent covers up on your roofs more than about 3 years old might want to check their mounting hole areas for cracking of the material.
