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WaterFurnace Geothermal 24x28x1 MERV 10 Airguard Air Filter 4 Pack Negative Air Machine boosting the air cleaner's efficiency ICRA Compliance Bundles boosting the air cleaner's efficiency The Nordyne 918737 air filter media should be changed once a year in standard applications for low maintenance Common WaterFurnace geothermal heat pump models using the 24×28×1 pre filter include: What’s Included
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