A pneumatic door spring, also known as a pneumatic door closer, is a device designed to automatically close a door after it has been opened, using compressed air to control the speed and force of the closing action. This mechanism typically consists of a cylinder filled with air, a piston, and a spring. When the door is opened, the piston compresses the air inside the cylinder. As the door is released, the air pressure gradually pushes the piston back, allowing the door to close smoothly and quietly.

Pneumatic door springs are commonly used in both residential and commercial settings to ensure doors close securely, enhancing security and energy efficiency by maintaining proper interior climate control. They are adjustable, allowing users to set the desired closing speed and force, and are ideal for reducing wear and tear on doors and frames. Additionally, they contribute to safety by preventing doors from slamming shut unexpectedly.

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