Suburban Furnace Low Air Flow Switch 231930 (DD Series)
All Suburban Serial Numbers manufactured after January 1990, will be nine digits. The first two (2) digits signify the year of manufacture. The next set of digits, indicate the week of the year and the remaining digits are serial numbers.
Compatibility: Suburban Furnace DD-17DSI (Serial Number Above 912000061)/ DD-12P/ DD-17P