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Make-Up Air Is essential in today’s homes as modern homes are equipped with a wide array of appliances — clothes dryers, gas stoves, water heaters, fireplaces, and HVAC systems — all of which vent air to the outside during operation. While this is necessary for safety and performance, it creates a challenge: the air that is exhausted to the outside must be replaced.

We spend most of our lives inside — yet few of us stop to consider a vital part of that environment: the air we breathe. Surprisingly, indoor air can be 2 to 5 times more polluted than outdoor air.