Sampling Tube, Finish Steel , Duct Mounting, Depth (In.) 5/8, Height (In.) 5/8, Length (In.) 30, Tube Length (Ft.) 2-1/2, Width (In.) 5/8, Duct Width (Ft.) 1 to 3, Standards UL, Includes Notched Sampling Tube, For Use With SL and RT Series Smoke...