ST9120U1011 Honeywell Adjustable Electronic Fan Timer. Includes wire harnesses and instructions. New Universal platform that will not only integrate control of all combustion blower and circulating fan operations in a gas warm air appliance but also replace all other existing Honeywell fan timer boards. It now has a replaceable fuse and DIP switch with selectable heat and cool delay for added flexibility. This new fan timer will also save you time and money with its diagnostic LED and continuous EAC and HUM terminal connections. These new options and features make it the best fan timer for your needs.