The front perforated plenum provides the required make-up air.  It discharges make-up air at a very slow velocity so it does not interfer with the capture & containment of the hood.

The perforated stainless steel discharge along the bottom of the plenum evenly distributes the air along the length of the hood and enhances the aesthetics of the hood.  The internal perforated diffuser is a key design feature that promotes the even distribution of air flow across the length of the hood.

The plenum can fit inside a ceiling grid so it flush with the ceiling.   This offers an unobstrusive way to get make-up air into the kitchen.

The hood is ideal for any kitchen ventilation application with a heavy cooking load that requires a high percent of make-up air.