Air supply or extract grille fascia for applications using a separate plenum box. Grille flange features a return edge to provide clearance on the plenum lip. Security clutch screw fixing through the grille flange. The enhanced GPP series (Home Office specification for Police use) comprises of a 2mm stainless steel fascia perforated with 2mm dia holes at 4mm centres on a triangular pitch.
(Last updated on 31/05/2023)