
Air Distribution Products: HHE/PFCD
AirVent family →The perforated diffuser is the architect's compromise solved: a face of small holes that reads as ceiling, backed by plenum geometry that diffuses like a visible terminal. Low noise, even discharge, and a face that paints with the ceiling: in round, square and rectangular formats.

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The face is only the exit; the plenum behind it does the work. A engineered perforated diffuser matches louvered terminals for mixing and noise while visually disappearing: which is why galleries and museums specify them.
Yes: faces are supplied paintable, and thin site coats do not measurably affect performance. Avoid heavy coats that close the perforations.
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