A firestop collar is typically used on which type of piping?

A firestop collar is specifically designed for use with plastic pipes, which are common in various building applications, including plumbing and HVAC systems. The firestop collar functions by creating a barrier that prevents the passage of fire and smoke through openings that plastic pipes might create in fire-resistance-rated walls or floors. When a fire occurs, the collar reacts to heat by expanding and sealing around the pipe, which is vital because plastic can lose structural integrity and collapse when exposed to high temperatures, potentially allowing flames and smoke to escape through the opening.

While there are firestop solutions for metal pipes and other materials, the distinct need for a firestop collar is most closely associated with plastic piping due to its susceptibility to heat degradation. This explains why choosing plastic pipes is the correct answer, as it directly aligns with the specific function of firestop collars in fire protection strategies.