Abstract: An adjustable roof jack adapted for mounting on a flat or pitched roof. The roof jack is connected to a lower end of an air discharge duct from an air conditioning unit and to the top of an air supply duct in the roof. The roof jack includes an angular-shaped sheet metal lower frame member having a front side, back side, a first side and second side. A lower portion of the sides of the lower frame member is received around the top of the air supply duct. Also, the lower portion of the sides of the lower frame member is integrally formed into to an outwardly extending roof flange. The roof jack also includes an angular-shaped sheet metal upper frame member having a front side, a back side, a first side and second side. A top portion of the front side of the upper frame member is hinged to a bottom portion of the front side of the upper frame member.

Abstract: A keyless seal lock is disclosed which includes a shackle and a lock body. The lock body is provided with a sliding bolt which secures the shackle to the lock body and substantially prevents removal of the shackle from the lock body without deformation of the lock. The lock shackle is provided with a weakened portion which may be severed in order to remove the lock. Once the shackle has been severed, the shackle may be removed from the lock body without further deformation of the lock. In this manner the seal lock may be removed without damaging the lock body, and the lock body may be reused.