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Maxitrol 12A49 12A49 1/2" Npt. Automatic Vent custom-tabs The high-quality materials used inMaxitrol 12A49 1 2" Npt. Automatic Vent: Enhancing Efficiency and Safety in Fan and Limit Controls Introducing the Maxitrol 12A49 1 2" Npt. Automatic Vent, the ultimate solution for optimizing the performance of 325 7 & 325 9 Series with OPD210E. Designed and manufactured by Maxitrol, a trusted brand in the industry, this vent limiting device ensures unmatched efficiency while prioritizing safety. Made in the United States, this product is set to