Carrier 311213-403 Collector Box

As a veteran tech, you know that a hairline crack in a condensate collector box is the quickest way to trigger a pressure switch lockout and kill a high-efficiency furnace during a cold snap. The Carrier 311213-403 Collector Box is the genuine OEM replacement designed specifically for the cold end of 90% AFUE secondary heat exchangers. Built from high-grade, heat-stabilized composite, this condensate management component handles the corrosive acidic runoff inherent in high-efficiency combustion without the premature warping or brittle failure seen in after-market alternatives. It is a direct drop-in for Carrier, Bryant, and Payne furnace parts, ensuring the airtight seal necessary to maintain precise inches of water column (WC) for the draft inducer. Whether you are addressing a furnace leaking water or a 311213-403 replacement, this 311213-403 collector box provides the exact port alignment and internal baffling required for optimal combustion drainage and system reliability across countless 58DXA, 58SX, and 398AAV series models.

• OEM Precision Fit: Eliminates the need for field modifications, ensuring a perfect seal against the secondary heat exchanger.
• Corrosion Resistance: Engineered to withstand the low pH levels of furnace condensate, preventing leaks and secondary damage.
• Direct Compatibility: Replaces legacy part numbers 308090-403 and 308570-303, facilitating a seamless furnace repair.
• Inducer Efficiency: Restores the proper vacuum pressure required for the inducer motor to operate without tripping safety limits.

• What are the dimensions of the Carrier 311213-403? This collector box typically measures approximately 14-1/4" x 4-3/4" x 2-1/2", conforming to the narrow-chassis 90% furnace specifications.
• Why is my collector box cracking? Thermal cycling and the acidic nature of condensate can cause fatigue in older plastics; replacing with an OEM 311213-403 restores factory-spec durability.
• Does this include the gasket? Most Carrier furnace collector boxes require a separate gasket or RTV sealant as specified by the manufacturer service manual for a pressure-tight installation.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.