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NXMRD AssemblyInstructions STEP 1 Included in the M-Series vent unit with radiation damper are three pieces: 1) the M-series unit 2) the radiation damper with sleeve 3) the grille STEP 2 On two sides of the radiation damper sleeve are holes near the bottom of the damper sleeve.
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NXMLRD ASSEMBLY INSTRUCTIONS Included in the M-Series vent unit with light and radiation damper are three pieces: 1) M-Series unit 2) Radiation damper with sleeve 3) Grille with light Step 1 On two sides of the radiation damper sleeve are holes near the bottom of the damper sleeve.