Face Plate Vents present a Mild Steel Louvered Grille designed to satisfy all types of air transfer application in offices, shops, schools, hospitals and many other commercial projects. Manufactured using modern press machinery and production techiques, the vents are robustly fabricated from 20swg mild steel and comprise of horizontal louvers set on an 8.5mm pitch with a 30% downward deflection. Suitable for internal, surface mounting in doors and walls. The steel construction ensures that the unit is satisfactory not only for Intumescent Fire Grilles but can also be used in standard air transfer applications, utilised with the wide flange border providing adequate clearance for fixing to the surrounding structure. Slimline and unobtrusive, the unit offers a free area around 70% for economical selection. INTUMESCENT FIRE GRILLES TO SUIT WILL NEED TO BE 45MM SMALLER, BOTH HEIGHT & WIDTH OF THE CHOSEN VENTILATOR SIZE.