Pemko 411APKL42 Full Mortise Automatic Door Bottom 42 in

Product Description

The PEMKO 411APKL42 is a full mortise automatic door bottom designed to seal the gap between the bottom of a door and the threshold or floor surface. When the door closes, the mechanism automatically drops a PemkoPrene seal into contact with the floor, then retracts when the door opens. This action prevents air infiltration, drafts, moisture, dust, and sound transmission. The unit ships at 42 inches in length to fit a standard 3-foot 6-inch door and is finished in mill finish aluminum. It is installed by door hardware specialists, general contractors, or finish carpenters on commercial or residential applications requiring a clean mortise-mounted solution.

This door bottom is suited for new construction and retrofit applications where a concealed, mortise-style installation is required. The automatic drop-seal action makes it appropriate for exterior doors, vestibule entries, and interior doors where acoustic control, smoke containment, or energy efficiency is a priority. The mill finish aluminum housing blends with standard commercial door hardware and holds up to high-traffic door cycles without visible hardware exposure on the face of the door.

Key Features

• Full mortise mounting keeps all hardware concealed within the door edge for a clean appearance
• Automatic drop-seal mechanism lowers the PemkoPrene seal on closing and retracts on opening
• 42-inch length fits 3-foot 6-inch door width
• Mill finish aluminum housing resists corrosion and suits standard commercial door applications
• PemkoPrene seal material provides durable contact against thresholds and finished floor surfaces

Compatibility

Designed as an OEM-style replacement or new-installation door bottom for full mortise applications on commercial and residential doors requiring an automatic drop-seal assembly.

Installation Notes

Installation is typically performed by a door hardware specialist or finish carpenter. The door must be routed to accept the full mortise housing before the unit is set and fastened. Verify door thickness and mortise depth before ordering. Adjust the actuator mechanism and seal height after mounting to ensure proper seal contact without binding the door swing.