Air Filter / Echo A226000032Pack Size:1Echo A226000031, Echo A226000032Dealer Choice 15-2101, J. Thomas PB-6515, Laser 93283, Landscaper Express 10-0848, Landscaper Pro 10-0848, Mow More EC10269, NHC 207-7169, Oregon 30-439, Oregon 30-439-1, Ratio Parts 170-391, Rotary 10269Echo 400, 500, 600 and 700 series backpack blowersLength: 4 5/32 ", Height: 1 3/8 ", Width: 2 5/8 "