Allied Air 58w12 Header Box Gasket Replaces R42381-002

Product Description

The ALLIED AIR 58w12 is a header box gasket designed to seal the header box assembly on warm-air furnace systems. This gasket creates a reliable barrier against combustion gas leaks and pressure loss at the header box interface, maintaining the integrity of the heat exchanger section. Licensed HVAC technicians typically install this part during scheduled maintenance, heat exchanger inspections, or when replacing a damaged or deteriorated original gasket. It is a direct OEM-style replacement for part number R42381-002.

This gasket is suited for residential gas furnace applications where the header box must be properly sealed to prevent flue gas bypassing or efficiency loss. It is commonly replaced during heat exchanger service calls, combustion inspection procedures, or any time the header box is removed and reinstalled. Installations where the original gasket shows cracking, compression set, or signs of heat degradation are the primary service scenario for this part.

Key Features

• OEM-style replacement for superseded part number R42381-002
• Seals the header box assembly to prevent combustion gas leaks
• Designed for residential warm-air gas furnace systems
• Maintains heat exchanger section pressure integrity
• Direct-fit replacement simplifies installation during service

Compatibility

Supplied as a direct replacement for OEM part number R42381-002. Designed as an OEM-style replacement gasket for ALLIED AIR residential gas furnace header box assemblies.

Installation Notes

Installation should be performed by a licensed HVAC technician. Before servicing the header box, shut off all gas supply and disconnect electrical power to the furnace at the disconnect switch or breaker. Remove any residue from the mating surfaces before seating the new gasket to ensure a proper seal. Follow all applicable local codes and manufacturer service documentation when reassembling the header box.

Technical Specifications

• Part Type: Header Box Gasket

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: 58w12