Lennox Y8698 BOSS 81221 812 Fire Block Foam is a professional-grade expanding foam sealant designed to help seal gaps, penetrations, and voids in residential and commercial applications. This pink fire block foam comes in a 20 oz Genius Gun container, allowing for precise, reusable application without the need for a separate foam gun. The controlled dispensing system helps reduce mess while delivering consistent coverage.

The BOSS 812 Fire Block Foam is commonly used in HVAC, electrical, plumbing, and general construction work to limit air movement and help slow the spread of fire through wall cavities and penetrations where fire blocking is required. Its expanding formula improves energy efficiency by reducing drafts and air infiltration once cured.

This product is part of the BOSS 812 Series and is suitable for professional installers, maintenance technicians, and contractors who require reliable fire block sealing performance in a convenient, ready-to-use format. Ideal for new installations, retrofits, and service applications where durability and ease of use are essential.