All range of louvers can be choose recessed and surfaced. Product Name: Recessed / Surfaced Louver Specifications: 1) Use for: construction project, office, ... ,3X20W,3X30W,3X40W, 4X20W, 24X30W, 4X40W, 3) Voltage: 110V,120V,127V,220V,240V 4) Frequency: 50/60Hz 5) Material: Steel base for 0 ... or V shape . 6)Packing: Standard export carton T8/T5 Recessed/Surfaced Grille lamps(Grid lamp/Louver fixture)