The Makeup Air System automatically compensates for an exhaust system with fan-powered, proportionally adjusting makeup air. It's designed for residential kitchen supply systems that have exhaust needs of up to 750 cfm or 1,200 cfm.
The true makeup air solution is a powered system: it automatically and infinitely tempers and modulates supply airflow in proportion to the kitchen hood exhaust air, creating a truly balanced indoor climate in your home. Anything else is cheating the Code.