window designed to be installed on a sloping surface (Usage “stationary roof windows” are non-operating; “venting roof windows” have the sash hinged at the top, swing outward and are operated by manual or automatic equipment.
window designed to be installed on a sloping surface (Usage “stationary roof windows” are non-operating; “venting roof windows” have the sash hinged at the top, swing outward and are operated by manual or automatic equipment.