3m Innovative Properties Company

Minnesota Mining and Manufacturing Company

Anthony J Schommer

Paul J Cobian

DuWayne C Radke

Paul J Charland

A cast-in-place pass through firestop device for providing a passage in a partition through which wires, cables, pipes, and the like are run includes a housing having a riser portion with frangible connections that define removable bands that can be readily removed by a user to adjust the height of the device in accordance with the thickness of the partition into which the device is installed. The removable bands include pull tabs that provide grasping means to facilitate removal of the bands by a user along a frangible connection. The housing also includes a base portion including a recess with ribs for maintaining firestop material in spaced relation from the base portion sidewall. A flame retardant char forming material, which works in combination with the firestop material to provide a fire, smoke, and water barrier, may also be provided adjacent the firestop material.

Pass through firestop device

The invention relates to a firestop assembly for a pipe, comprising first and second intumescent firestop rings. The first intumescent firestop ring overlies the pipe, and extends along the pipe for a first distance, and the second intumescent firestop ring overlies the first intumescent firestop ring and extends along the pipe for a second distance. The first distance is not equal to the second distance, and the firestop assembly so provided is particularly adapted for firestopping a plastic pipe.

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Cottage Grove, MN, United States of America

Anthony J Schommer