D2 2-Wire Photoelectric Duct Smoke Detector

DST1 Metal Sampling Tube Duct Width up to 1ft (0.3m)

DST1.5 Metal Sampling Tube Duct Widths 1 ft to 2 ft (0.3 to 0.6 m)

DST10 Metal Sampling Tube Duct Widths 8 ft to 12 ft (2.4 to 3.7 m)

DST3 Metal Sampling Tube Duct Widths 2 ft to 4 ft (0.6 to 1.2 m)

DST5 Metal Sampling Tube Duct Widths 4 ft to 8 ft (1.2 to 2.4 m)