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The Aprilaire 6402 is the correct expansion panel for the following control panels:
The Aprilaire 6402 - 12-Zone Control Expansion Panel is used with the Aprilaire model 6404 control panel to expand from four to twelve zones in two zone increments. The Aprilaire control panel is fuse protected and features LED indicators for start-up and troubleshooting.
Aprilaire 6402 - 12-Zone Control Expansion Panel specifications: