D.W Taiwan Door Closers Series.

A door closer is a mechanical device that automatically closes a door after it has been opened.
Here are some key types and features:

1. Hydraulic Door Closers: These use fluid to control the door’s closing speed and force.
   They are commonly used in commercial buildings for their durability and smooth operation.
2. Pneumatic Door Closers: These use air pressure to close the door.
   They are often found in residential settings, particularly for screen and storm doors.
3. Concealed Door Closers: Installed within the door or frame, these closers are hidden from view,
   providing a clean and aesthetic appearance.
4. Surface-Mounted Door Closers: These are visible and mounted on the surface of the door or frame.
   They are easy to install and adjust.
5. Floor Springs: These are installed on the floor and are used for heavier doors, such as glass doors in commercial buildings.
6. Transom Closers: These are concealed within the top transom of the door and are used for specific architectural requirements.

Companies like D.W Taiwan manufacture high-quality door closers and other hardware in Taiwan.