Modular system to construct interior stables that has a permanent hole in a "V" shape to let the horse put the head outside, an another to feed him. Or you can instead choose a small window to open it and close it wherever you want.

They are manufactured in three standard lengths of 3, 3.5 and 4 meters. Thick walls and doors to choose between 42mm and 32mm. Galvanized iron metal frame and 3 types of wood to choose or solid polyethylene which does not needs any maintenance.

See attached document for details