Patent ID: 8438807

Claim:
A firestop drain assembly for use in a partition having a first side and a second side, which comprises: a) a base configured to be mounted in the partition; b) a strainer connected to the base and configured to be adjacent the second side of the partition; c) a firestop extension housing having opposed first and second ends with an inner passageway extending therebetween and having a length between the first and second ends, and connected at the first end to the base and extending outward from the base to the second end in a direction opposite the strainer; d) 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 and configured to extend beyond the first side of the partition in the direction opposite the strainer; and e) firestop material positioned in the inner passageway of the firestop extension housing adjacent the second end of the firestop extension housing, such that in use, when the base is mounted in the partition, all of the firestop material is located beyond the first side of the partition in the direction opposite the strainer, the firestop material having a length, thickness and rate of expansion such that when the drain assembly is mounted in the partition and the first side of the partition is exposed to fire, a portion of the drain pipe located in the inner passageway of the fire 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 having a length, thickness and rate of expansion such that 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 assembly has a T-rating of at least one hour.