The PS-DB positive pressure switch has been introduced for use with the Airmaster® Turbo™ inline duct fan in dryer vent booster applications, says the company. The switch senses a positive pressure in the dryer duct and starts the booster fan; the switch runs the fan for approximately 10 minutes and then turns off the power, the manufacturer says. The sequence continues until the dryer stops and the switch no longer senses a positive pressure in the duct.

AirmasterFan Co., Dept. TPR, P.O. Box 968, Jackson, MI 49204; 517-764-2300; 517-764-3838 (fax).