The Field Controls CK-41F Control Kit F 24V Gas Fixed Post Purge 46282641 is a control kit designed for gas-fired HVAC heating equipment, including furnaces and boilers. Operating on 24V, it manages the operation of a draft inducer or exhaust system and provides a fixed post-purge cycle after the burner shuts off. This helps clear residual combustion gases from the venting system, sup... https://www.partshnc.com/ck-41f-field-controls-control-kit-for-24v-gas-fixed-post-purge-46282641-replaces-ck-41-ck-44-ck-40f