A door closer is a mechanical device, often hydraulic, that automatically and controllably closes a door after it’s been opened, serving to enhance security, maintain fire safety by ensuring fire doors remain sealed, control air temperature, and prevent slamming, thereby improving accessibility and reducing noise. These devices come in different “power sizes” to match the door’s weight and can be fitted in various configurations, including overhead surface-mounted, concealed in the frame, or hidden within the floor.

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