Feature = Low-Flow Technology: Both Ionization and Photoelectric models listed for velocities between 100-4000 ft./min Both models listed for high-temperature applications Operating voltages: 230VAC, 115VAC, 24VAC, 24VDC Interconnect up to 30 units for common functions Patent pending "No-Tools Required" front or rear loading and removing sampling/exhaust tubes Patent pending "Test Port Valve" allows for aerosol smoke testing without cover removal Clear cover fitted with four captive "No-Tools Required" th (page 1 / 1)