HF-012 Egg Crate Grilles-Hinge style 1)Material:Aluminium alloy . 2)The egg crate grilles are either ceiling mounted or wall mounted air terminal devices used as exhaust air grilles for domestic and industrial applications. 3)The core of the egg grille is made of aluminum strips assembled to form equally distributed and sized square cells,which can be opened like a door,easy for cleanliness. 4)The frame of the egg crate grilles is made of aluminium alloy bars. 5)White powder-coating finish or no painting for choice, or color you are prefer. 6)OBD or filter is optional. 7)Easy installation and maintenance 8)OEM is available. Outer standard Size: As per your request(Neck size+34mm) Height:40mm Neck size: A*B(size is as per your request) Order Notes: Item-neck size A?-color/(OBD/filter or not)