Patent ID: 8191647

Claim:
A dry sprinkler installation comprising: a support structure having an insulated wall with interior and exterior surfaces defining opposing openings communicating with a passage wall defining a passage extending between the interior and exterior surfaces; a layer of insulation disposed between the interior and exterior surfaces of the insulated wall; a dry sprinkler having a casing and a sprinkler head supported at one end of the casing, the sprinkler head including a deflector and a thermal response device, the sprinkler head extending through the opening of the interior surface of the insulated wall, an exterior surface of the casing and the passage wall defining a uniform annular air gap between the casing and the layer of insulation, the space also including a passage air pocket consisting of air disposed in the space; and a flexible annular sealing device positioned about the casing, the flexible annular sealing device including a body defining a throughbore having a first end having a curved planar surface dimensioned to sealingly engage the outer circumference of the casing and a second end having a flat planar surface positioned to sealingly engage the exterior surface of the insulated wall, the throughbore defining a throughbore air pocket consisting air disposed in the throughbore, the throughbore air pocket communicating with the passage air pocket through the opening of the exterior surface of the insulated wall.