Easily wire in-line register booster fans, ducted air purifiers, whole house humidifiers, duct heaters, and dryer booster fans for an increase in airflow with the Tjernlund PS1503 Duct AirStat. When wired vertically, this positive pressure switch closes contacts when the air kicks on, operating a nearby installed air purifier, booster fan, and more.

Just mount to the plenum, trunk, or branch lines.

Compatible Appliances

• Whole House Humidifiers
• Ducted Whole Air Purifiers
• Dryer Duct Booster Fans
• In-line Register Booster Fans