The Tjernlund Duct Airstat senses positive pressure in a forced air heating and/or cooling system. Single pole, single throw, snap-acting switch. Typically used to activate boosting fans.From $46.00
General purpose airflow proving switch designed for HVAC applications. Used to sense positive, negative, or differential air pressure.From $38.20
Wet to wet differential pressure switch. Differential set point ranges are available from 2.5 to 75 psid on increasing DP and 1.0 to 67 psid on decreasing DP.From $65.00
For air and non-combustible compatible gases. Set points from 0.07 to 20" w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw.From $45.75
DPDT switch with manual reset. Combines small size with 4% set point repeatability. No power is required to operate the DPDT switch.From $115.00
General purpose airflow proving switch designed for HVAC and Energy Management applications. It may be used to sense positive, negative, or differential air pressure.From $64.20
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