Where a vent passes through a sloping roof or ceiling this adjustable firestop accommodates the oval shape

Where a vent passes through a sloping roof or ceiling this adjustable firestop accommodates the oval shape. A firestop spacer must be used on both sides of the penetration to provide a barrier to fire and maintain a 50mm air gap clearance to combustible materials

If using a support plate where the pipe penetrates then only one firestop plate on the underside is required