If your diagnostics show a collector box blockage or a leak in the header box that triggers the pressure switch

pre-programmed for immediate installation into compatible Lennox units

Designed to facilitate efficient Resistance Start Induction Run (RSIR) configurations

Directional Versatility: Suitable for both vertical (upward) and horizontal piping layouts

Advanced Distributor Products 76710100 Gasket 328140-751 If your diagnostics show aThe Advanced Distributor Products 76710100 Gasket is a high performance flue box gasket engineered to provide a robust seal for critical HVAC equipment. Specifically designed for compatibility with HED and SEP 100 145 series unit heaters and furnaces, this OEM replacement part ensures that combustion gases remain safely contained within the venting system. By maintaining a precise airtight seal between the flue box and high temperature components,