Originally Posted by The Recycled Teenager
But how much will that influence the breathing and I think it will
OK where's the experts on this
From the looks of the mesh, it's way less than 50% open space, so putting it on the 3x3 opening might reduce it to more the equivalent of a 2x2, which is 4sq" vs 9sq"...not good at all. There is enough area when you've got it spread over the entire air filter that it's probably no worse than the air filter itself...not so with the 3x3 opening.