Pemko 411ARL28 Full Mortise Automatic Door Bottom 28 in

Product Description

The PEMKO 411ARL28 is a full mortise automatic door bottom designed to seal the gap between a door and the threshold when the door is closed. The unit retracts automatically when the door opens and drops to form a seal when the door closes, using a sponge neoprene gasket to block drafts, dust, moisture, sound, and light. Finished in mill finish aluminum, this door bottom installs into a routed mortise channel in the bottom edge of the door. It is suited for commercial and residential applications where consistent threshold sealing is required. Installation is typically performed by a licensed door hardware technician or general contractor.

The 411ARL28 is sized for doors with a 28-inch (2 feet 4 inches) active width. The automatic drop mechanism activates through contact with the door stop or frame as the door closes, making it appropriate for single-door commercial entry applications, office suites, hotel corridors, and similar settings where perimeter sealing is a code or performance requirement. The sponge neoprene seal provides a compliant, compressible contact surface that accommodates minor threshold irregularities.

Key Features

• Full mortise mounting style — recessed into the door bottom edge for a flush, low-profile appearance
• Automatic drop action — seal deploys on door close and retracts on door open without manual adjustment
• Sponge neoprene gasket — compressible seal blocks drafts, dust, moisture, and sound
• Mill finish aluminum construction — corrosion-resistant and suitable for standard interior and light commercial exterior applications
• 28-inch active length — designed for doors with a 28-inch clear width

Compatibility

Designed as an OEM-style mortise automatic door bottom replacement or new-installation component for standard commercial and residential doors requiring a 28-inch sweep seal in a full mortise configuration.

Installation Notes

Installation requires routing a precise mortise channel into the bottom edge of the door to the manufacturer-specified depth and width before fitting the unit. A licensed door hardware installer or finish carpenter should complete this work. Verify door thickness and bottom rail dimensions are sufficient to accept a full mortise unit before ordering. Confirm the threshold profile is compatible with the neoprene seal drop height prior to installation.