Patent ID: 8191330

Claim:
A method of preventing fire adjacent a first side of a partition from moving through a drain mounted in the partition to a second side of the partition, which comprises the steps of: a) providing the drain having a base with a strainer connected to the base, a firestop extension housing having opposed first and second ends with an inner passageway extending therebetween connected at the first end to the base and extending outward from the base to the second end in a direction opposite the strainer; b) providing a drain pipe connected to the base and extending outward from the base through the inner passageway of the firestop extension housing and beyond the second end of the firestop extension housing in the direction opposite the strainer; c) providing firestop material having a length, thickness and rate of expansion and positioning the firestop material in the firestop extension housing such that when the base is mounted in the partition, all of the firestop material is located beyond the first side of the partition spaced apart from the first side of the partition and selecting the length, thickness, rate of expansion and position of the firestop material such that when the first side of the partition is exposed to fire, a portion of the drain pipe located in the inner passageway of the firestop extension housing melts before the firestop material expands into contact with the portion of the drain pipe located in the inner passageway of the firestop extension and the firestop material expands to seal the inner passageway of the firestop extension housing before a temperature of the strainer is greater than approximately 325° F. (163° C.) above an ambient temperature of the strainer so that the drain has a T-rating of at least one hour; and d) mounting the base in the partition so that the strainer is adjacent the second side of the partition and the second end of the firestop extension housing extends beyond the first side of the partition.