The most useful fittings for doorways are those which serve the dual purpose of opening and closing a door. A door fitter can customize the operations of the sash or fusible link door to fit the door's intended use. This is achieved by installing fittings on either side of the doorway.

The Sash (or trash chute) has a metal rod that's set to the studs at the door's interior. The rod extends from the door's bottom to the top, when the door is opened. When the door is closed, the pole pivots into the very top, protruding out of the doorway at an angle. The angle is adjusted in accordance with the distance between the top of the fixture and the top edge of the door sill. As the fixture is extended to its highest point, it contacts at the surface of the wall studs, causing the door to open and shut automatically.

This fusible link door fixture is typically incorporated into kitchen doors. These doors are made from steel. The fusible link attachment adds a new dimension into the door's operation.

A few fusible link door fixtures require the setup of an additional plate. The plate supports the door opener to permit the fixture to get in touch with the top of the wall studs. The fixture is lowered to the studs. After the door is set up, the plate has been set up. This plate is joined to the fixture using a steel bolt, so making the fusible link system permanent.

There are many different types of fusible link door fittings available, such as cord and belt systems. Belt systems are more reasonably priced than cord systems, but the result is significantly less convenient and more expensive method to operate the door. The belt system is operated by a little chain which is pivoted to allow the door to shut and open. The chain is looped through a bearing plate, which enables the chain to move up and down. After the door is opened, the string is forced against the door bearing, causing the door to close and open.

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