Lennox 59L20 Collector Box Gasket

Description

The Lennox 59L20 is a genuine OEM replacement Collector Box Gasket designed to maintain a proper airtight seal at the collector box assembly on compatible Lennox furnaces. A properly functioning collector box gasket is critical to safe and efficient furnace operation — it prevents flue gas leakage, maintains correct draft pressure, and protects the heat exchanger and inducer assembly from exhaust bypass.

Product Overview

The collector box is the component that channels combustion exhaust gases from the heat exchanger into the inducer assembly and ultimately out through the flue. Over time, the gasket that seals this junction can degrade due to heat cycling, vibration, and age, leading to potential flue gas leaks, pressure switch faults, or reduced heating efficiency. Replacing a worn or damaged collector box gasket with the genuine Lennox 59L20 restores a secure, leak-free seal and helps return the system to factory-specified performance.

Key Features

• Genuine Lennox OEM replacement part — ensures proper fit and compatibility
• Designed to seal the collector box assembly on compatible Lennox furnace models
• Helps prevent flue gas bypass and maintains correct inducer draft pressure
• Durable gasket material engineered to withstand repeated heat cycling
• Direct drop-in replacement — no modification required
• Supports proper pressure switch operation by maintaining a sealed collector box

Application

• Compatible with select Lennox gas furnace models — verify compatibility with your unit’s model and serial number before ordering
• Ideal for use during annual furnace maintenance, heat exchanger inspection, or inducer motor replacement

Why Replace Your Collector Box Gasket?

A failed or deteriorated collector box gasket can cause a range of furnace issues, including nuisance pressure switch lockouts, flue gas odors, and reduced combustion efficiency. Using a genuine Lennox OEM gasket like the 59L20 ensures the replacement meets original design specifications, helping to restore safe and reliable furnace operation.