Pemko 252X3AFG 48 Door Threshold Thermoseal Insert

Product Description

The PEMKO 252X3AFG 48 is a door threshold with an integrated ThermoSeal insert, designed for installation at the base of exterior door frames. Measuring 0.5 inches in height, 5.125 inches in width, and 48 inches in length, this threshold provides a weathertight transition between the door bottom and the floor surface. The mill aluminum finish offers corrosion resistance without additional coating. It is sized for standard single-door openings and is installed by door and hardware technicians, carpenters, or general contractors during new construction or replacement service.

This threshold is suited for residential and light commercial exterior door applications where air infiltration control and a durable floor transition are required. The ThermoSeal insert runs the length of the threshold and compresses against the door bottom sweep to reduce drafts and energy loss at the door sill. It is appropriate for use on hinged entry doors in standard 48-inch wide rough openings or two-door assemblies where each panel requires its own sill profile.

Key Features

• ThermoSeal insert provides a compressible seal against the door bottom sweep to limit air infiltration
• Mill aluminum construction resists corrosion and withstands exterior exposure
• 48-inch length fits standard single exterior door openings and can be field-cut for narrower applications
• Low-profile 0.5-inch height minimizes trip hazard at the sill
• 5.125-inch width provides a broad bearing surface across the door frame width

Compatibility

Designed as an OEM-style replacement or new-installation threshold for standard residential and light commercial exterior hinged door assemblies requiring a 48-inch sill profile with an integrated ThermoSeal insert.

Installation Notes

Door thresholds of this type are installed by carpenters, door hardware specialists, or general contractors. The threshold is typically fastened through pre-drilled holes into the subfloor or sill framing using appropriate screws for the substrate material. The existing door bottom sweep or seal should be inspected and replaced as needed to ensure proper compression against the ThermoSeal insert. Field-cutting with a fine-tooth metal blade is acceptable when the opening requires a shorter length than 48 inches.