Regular, parallel and over-door mounting. Adjustable closing and latching speed valves with overload protection. The Lockwood 724 series closer has been successfully tested up to four hours (depending on type of doorset) on fire door assemblies in accordance with Australian Standard AS1905.Non-handed, Suitable for both Left hand and Right Hand doors. Adjustable Back Check and Hold-open can be set at any angle up to 150° of opening.