This genuine Aprilaire 201 filter features a surface-loading design that captures up to 88% of airborne particles between 3

although technicians should always verify dip switch settings or jumper configurations against the original board's setup

improper expansion valve hunting

this model features an adjustable switch point

Field-serviceable design reduces downtime compared to complete valve replacement

Markel ET9STS Stat 323055-751 This genuine Aprilaire 201 filterThe Markel ET9STS is a heavy duty line voltage thermostat engineered specifically for high capacity heat only applications. Built with a single pole single throw (SPST) snap action switch, this industrial heating control is rated for 22 Amps at 120 277V resistive loads, making it a reliable choice for direct connection to baseboard heaters, fan forced unit heaters, and radiant heating elements. The bimetal actuator provides a consistent 2 degree