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The Aprilaire 5158 fits the following model ventilator:
The Aprilaire 5158 Air Flow Measuring Device measures the air flow inside the Aprilaire 8100 Energy Recovery Ventilator. The Aprilaire 8100 Energy Recovery Ventilator takes the stale air out of your house and replaces it with fresh, clean air. The Aprilaire 5158 weighs 4 ounces.