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The Series 104 Differential Pressure Switch is a low-cost easy to use switch for very low pressure applications. The switch can monitor positive, negative, or differential pressure and with an easy to adjust set point knob makes field set up and adjustment hassle free. The differential pressure switch includes a SPDT relay rated for 2A @ 250V and can be set as low as 0.08" w.c. (20 Pa).

The Series AFA Siren™ Air Flow Alarm is an airflow monitor designed to provide visual and audible indications for decreases in airflow. Its color changing LED's provide vibrant visual indication of the operating status of the unit. A crisp and clear audible alarm will sound when airflow decreases below the designated set point. The Siren™ offers multiple mounting options including bracket mounting and interlocking strips. The unit can be powered through the 6-position terminal connection or by use of a power adapter. The Siren™ offers the ability to customize the minimum velocity set point should there be a need for a set point greater than the standard 80% of operational velocity. All units come standard with a night set back option for those who are energy conscious. The Siren also fulfills the exhaust alarm requirement needed to be in compliance with NSF/ANSI Standard 49. A quick installation process, one-touch calibration, and one-touch reset make for an easy set up and easy use.