This guide provides technical information for design professionals and code authorities regarding the selection of UL Solutions certified products and systems to comply with model code requirements for fire and smoke protection in buildings. It outlines the importance of firestopping as a means of passive fire protection, detailing how it helps contain fires to their origin by sealing breaches in fire-resistance rated assemblies. The document describes various types of firestop applications, including joint systems and firestop solutions, and emphasizes the need for compliance with local building and fire codes. Additionally, it explains the significance of maintaining firestop systems throughout the life of a building to ensure safety. The guide also includes definitions of key terms, types of firestop applications, and the requirements for installation and maintenance of these systems, which are critical for limiting the spread of fire, smoke, and toxic gases in the built environment.