Colman model GSP is a robust, high quality Security Grille designed for use as a supply or extract grille in various applications where tamperproof features are required.
The GSP core is manufactured from 3mm mild steel perforated plate, having 3mm holes on a 5mm pitch with a free area of 37%. We can supply an opposed blade volume control damper operated through the face [plate with an Allen key. Grilles can be supplied with a galvanised steel sleeve and plenum box suitable for fixing through a compartment wall or ceiling. The plenum box can be provided with a camera access hole.