Trane XB90 (TDC1) furnace filter sizes
XB90 (TDC1) furnaces take 14 x 20 x 1 or 16 x 20 x 1 filters, depending on cabinet width and return.
Pick your full model number below for the exact size.
2 filters, each 14 x 20 x 1 (downflow top (external, in return duct)) or 2 filters, each 14 x 20 x 1 (downflow top (external) return)
2 filters, each 16 x 20 x 1 (downflow top (external, in return duct)) or 2 filters, each 16 x 20 x 1 (downflow top (external) return)