... different kinds of ventilation series products, such as:aluminium grille, stainless steel grille etc SQUARE GRILLEMaterial: stainless steel 304, aluminium, steelSuperficial treatment ... as stainless steel bulb steel grille, stainless steel cap grille, stainless steel round grille, stainless steel clap grille, aluminium grille, square grille etc. We are also ...