Lcn SEM7810E400AL 4 Inch Magnet Extension

Product Description

The LCN SEM7810E400AL is a 4 inch magnet extension designed for use with compatible electromagnetic door hardware systems. This accessory extends the magnet assembly to achieve proper door hold-open positioning in applications where standard reach is insufficient. It is a precision-fit component intended for commercial and institutional door control installations. Licensed door hardware technicians and commercial locksmiths are the primary installers of this type of accessory. The part ships as a single unit and is built to the dimensional tolerances required for reliable electromagnetic door holder performance.

This magnet extension is suited for high-traffic commercial environments including schools, hospitals, government buildings, and similar institutional facilities where electromagnetic hold-open door systems are part of the life safety or access control infrastructure. It is used when the door or frame geometry requires additional magnet offset from the standard mounting position to ensure secure hold-open function and proper door alignment.

Key Features

• 4 inch magnet extension reach for applications requiring offset mounting
• Compact profile: 4.88 inches long, 4.09 inches wide, 1.89 inches tall
• Lightweight construction at 0.1 pounds
• Sold as a single unit for individual replacement or installation
• Designed for use in high-traffic institutional door hardware applications

Compatibility

Designed as an OEM-style accessory for use with compatible LCN electromagnetic door hardware systems requiring a 4 inch magnet extension. Verify fitment against the specific LCN closer or holder model in service before ordering.

Installation Notes

Installation should be performed by a licensed door hardware technician or qualified commercial locksmith familiar with electromagnetic door control systems. Disconnect power to the electromagnetic hold-open unit before removing or installing any magnet extension components. Verify that all fasteners are fully seated and that the magnet face aligns correctly with the armature plate after installation. Consult the applicable building and fire code requirements, including NFPA 80, for door hold-open device installation in your jurisdiction.