Blowing out/tapping out air filters "seems" like a good idea to extend their life. Don't believe it. That actually will imbed particles in the filter that will clog it again faster, even though you are reversing the stock flow direction. Just replace them.
12 LS M6, IPF S/C, ASA GT-5 wheels, VMax PTB
1995 Mitsubishi Montero SR
1987 Dodge Raider Turbo Project
1986 Mitsubishi Montero 2.4l FI Transplant