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AC Infinity Airtap T4 120 CFM 4 in. x 12 in. Quiet Register Booster Fan with Thermostat Control, Heating Cooling AC Vent AC-RBF42-B - The Home Depot
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AC Infinity AIRTAP T4, Quiet Register Booster Fan with Thermostat Control. Heating Cooling AC Vent. Fits 4” x 12” Register Holes.: Amazon.com: Tools & Home Improvement
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