Installation Efficiency: Sized precisely at 12x18 inches for standard rectangular ducting

it operates entirely on line voltage and does not require batteries or a common/neutral wire for logic power

This specific model features a manual reset and power outage feature

this unit integrates seamlessly with RDM and ZDM dampers to manage bypass air without the need for complex field calibration

as the control logic is based on valve positioning and pressure/temperature sensor inputs processed through the main system controller

Aprilaire 6404 Control 319852-301 Installation Efficiency: Sized precisely atThe Aprilaire 6404 Control is a professional grade 4 zone control panel designed to provide precise HVAC zoning solutions for both residential and commercial applications. This universal multistage zone controller is compatible with single stage heat cool, multi stage conventional (up to 2H 2C), and heat pump systems (up to 4H 2C). Featuring an LCD display for setup and LED status indicators for real time diagnostics, the Aprilaire 6404 simplifies the