It is the termination of the ventilation ductwork, to put it simply. It's used in both gravity and mechanical ventilation systems.
Along with the practical purpose of terminating the ductwork without leaving a hole in the wall, air grilles also fulfill an important aesthetic function.
SGR air grilles for round ducts- made of hot galvanized sheet in a dimension range from 425 x 75 mm up to 825 x 225 mm. They are adjusted for mounting in round ducts of more than 160 mm in diameter.
SHR air grilles for rectangular ducts - made of galvanized sheet powder-painted white acc. to RAL 9016 in a dimension range from 200 x 100 mm up to 500 x 300 mm.
They are equipped with double lamellas - vertical and horizontal ones enabling adjustment of air intake. They are mounted to T-pieces by means of clips or to a flat duct with use of the SHR-RM mounting frame.