metal ventilation grill / square
The grille type A-770/A-780 is used for the exhaust of large quantities of air with minimal pressure loss in facilities such as offices, warehouses, shopping centres,... The grille can be mounted in the wall or the ceiling (only AE and AF).
grid core with square mesh or mesh with 45° deflection
mazes: 12,5 x 12,5 mm
free passage ca. 85%