Pemko 434APKL42 Full Mortise Automatic Door Bottom 42in

Product Description

The PEMKO 434APKL42 is a full mortise automatic door bottom designed to seal the gap between the bottom of a door and the threshold. When the door closes, the mechanism automatically drops the seal into contact with the floor or threshold surface, then retracts when the door opens. The unit is finished in mill finish aluminum and fitted with PemkoPrene gasketing material, providing durable weatherstripping performance. It is sized for a 42-inch (3 feet 6 inches) door opening. Licensed HVAC technicians, commercial door installers, and architectural millwork contractors typically specify and install this type of hardware.

The 434APKL42 is suited for commercial and residential applications where controlling air infiltration, moisture, dust, sound, smoke, or light under a door is required. Full mortise automatic door bottoms are commonly installed in office buildings, schools, healthcare facilities, and multi-family residential projects. This model is appropriate for use on wood or solid-core doors where a mortise pocket can be routed into the door bottom edge.

Key Features

• Automatic drop-seal mechanism activates on door close and retracts on door open
• Full mortise design mounts flush within a routed channel in the door bottom edge
• PemkoPrene gasketing material provides resilient contact seal against threshold or floor
• Mill finish aluminum construction for corrosion resistance and long service life
• 42-inch length fits standard 3 feet 6 inch wide door applications

Compatibility

Designed as an OEM-style mortise automatic door bottom replacement or new installation for standard commercial and residential doors requiring a full mortise drop-seal unit at 42 inches in length.

Installation Notes

Installation is performed by a qualified door hardware installer or finish carpenter. The door must be removed from its hinges to rout the mortise pocket along the bottom edge to the manufacturer-specified dimensions before inserting the unit. Verify the door thickness and bottom rail depth are sufficient to accept a full mortise unit before ordering. Follow applicable local building codes and fire-rated door assembly requirements when installing on labeled fire or smoke doors.