The filters fit inside the filter door on the side ofnon-self-propelled WindTunnel uprights and also standard Bagless uprights including newer Fold Away models. These models includebut are not limited to: C1701900, U5014900, U5016900, U5018900,U5140900, U5144900, U5145900, U5146900, U5148900, U5150900, U52719RM,U52729RM, U53019RM, U53029RM, U5348911, U5402900, U5409955, U5416900,U54219RM, U5436950, U5438960, U5453900, U5458900, U5458910, U5460900,U5462900, U5467900, U5468900, U5470900, U5481980, U5491900, U5491950,UH30015, UH30030HD. The filter measures 6 5/8"" x 3 5/16"" x 1/2"" andhas a green layer, a yellow layer and a white layer. It does not fitself-propelled WindTunnels.