A Lev door or convection doorway is an inside flooring-to-ceiling (comprehensive height) doorway, consisting of a normal door leaf and an upper leaf in place of the same old header wall. The leaves might or might not be divided by a transom. The doors allow helpful convection of warm air. https://car20630.sunderwiki.com/1586239/a_secret_weapon_for_international_relocation_company_kuwait