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Wiring Diagram. ○. In addition to these instructions, follow all installation instructions that are supplied with the damper. STEP 8: SETTING THE VENTILATION READ AND SAVE THESE INSTRUCTIONS Model 8120A & 8126A Your ventilation controller is installed in the return duct of your furnace or heat pump. For the installer, there are two sets of 'Installation and Safety Instructions': one inside the Controller carton and one inside the Damper carton. To get the 8126x installed in your home, use Find A Pro to find a contractor in your area. Model 8126X features: Provides fresh air only when needed. NeverView online (2 pages) or download PDF (949 KB) Aprilaire 8126 Installation instructions • 8126 PDF manual download and more Aprilaire online manuals. WALL PLATE. OUTDOOR TEMP SENSOR. INSTALLATION. MANUAL. #8 x 5/8" HEX HEAD cable from the control to either the damper in Model 8126X installations or.