Door filter replacement time interval, based on the installation enivironment.
heavyFiltration15days (1) indicates door filter needs to be replaced within 15 days.
normalFiltration30days (2) indicates door filter needs to be replaced within 30 days.
lightFiltration60days (3) indicates door filter needs to be replaced within 60 days.
notPresent(4) indicates that the door filter is not present.