Pemko STC411APK36 Automatic Door Bottom 36in Mill Aluminum

Product Description

The PEMKO STC411APK36 is an automatic door bottom designed to seal the gap between a door and the threshold when the door closes. As the door swings shut, the drop mechanism activates and lowers a seal against the floor, blocking drafts, sound, light, smoke, and moisture. When the door opens, the seal retracts automatically to prevent drag on the floor surface. This unit is finished in mill aluminum, offering a clean, low-profile appearance suited to commercial and residential door applications. It fits a 36-inch door width and installs directly to the face or bottom rail of the door. HVAC, weatherization, and general building contractors are the typical trades performing this installation.

The STC411APK36 is used in commercial buildings, offices, hotels, schools, and residential applications where acoustic control, smoke containment, or weathertight sealing is required at the door bottom. The automatic drop action makes it well-suited for high-traffic openings where a traditional door sweep would wear prematurely or interfere with floor transitions. The mill finish aluminum housing is durable in both interior and exterior door applications.

Key Features

• Automatic drop mechanism lowers seal on door close, retracts on open
• Mill finish aluminum housing resists corrosion and blends with standard aluminum door hardware
• 36-inch length fits standard 3-foot door width
• Seals against drafts, sound transmission, light gaps, and smoke infiltration
• Designed for surface-mount installation on wood or metal door bottoms

Compatibility

Designed as an OEM-style replacement or new-installation automatic door bottom for standard 36-inch residential and commercial doors with a 1-3/8-inch door bottom rail clearance.

Installation Notes

Installation is performed by finish carpenters, door hardware specialists, or general contractors. Before installing, ensure the door is properly hung and the floor surface is level across the full door width. The unit mounts to the interior face of the door bottom using the provided fasteners. Adjust the drop mechanism per the manufacturer instructions to achieve consistent contact with the threshold or floor without binding the door swing.