Power box assembly with built-in air flow switch and W8600F compatibility. This power box has an overall size of 24½ x 6½ x 3 inches. Includes a 60 inch power cord with 3-prong plug. Honeywell 2 year warranty. Installation requires setting ionizer jumper J4 for unit size 16x25 or 20x25. Then mounts with two screws, and plug in. This Series 2 power box can be used with the optional W8600F, but not the earlier W8600E. If using this power box without a W8600E or W8600F, then Series 1 or 2 does not matter. When using this power box with the W8600F, install the terminal strip and driver card that was supplied with the W8600F. Used in the 20x25 F50F1065 and 16x25 F50F1073 120v. Replaces 208417A 208417B.