Abstract: A draft inducer blower assembly for use with a water heater has a housing, a motor, and a fan. The housing has an exhaust volute surrounding the fan and a base adapted to be mounted atop a water heater. The housing has an inlet port adapted to receive exhaust gas from the water heater. The fan is connected to the motor for rotation about a rotation axis. The exhaust volute has a cut-off at a cut-off angle relative to the rotation axis. The exhaust volute has an exhaust outlet passageway that extends to an exhaust port. The exhaust port is lower than the top of the exhaust volute.

Abstract: A three piece full port ball valve for use with a form for producing a cast concrete article is provided wherein the housing of the valve has been modified by creating openings through the valve housing to access the flow opening in the ball member for clearing concrete slurry therefrom after the form has been filled. Additional openings in the housing at other locations can be created for cleaning around the ball member and the inside of the housing.

Abstract: A three piece full port ball valve for use with a form for producing a cast concrete article is provided wherein the housing of the valve has been modified by creating openings through the valve housing to access the flow opening in the ball member for clearing concrete slurry therefrom after the form has been filled. Additional openings in the housing at other locations can be created for cleaning around the ball member and the inside of the housing.

Abstract: A form for producing a cast concrete article can have a core at least partially surrounded by an outer jacket thus defining a cavity between an outer surface of the core and an inner surface of the outer jacket. A header can be provided generally sealed against the top of the outer jacket and around the top of the core. A bottom member can also be provided generally sealed against the bottom of the outer jacket and around the bottom of the core. The cavity thus being defined by the outer jacket, core, header and bottom member. A fill port, which can be selectively opened or closed, can communicate with the cavity through the outer jacket for filling the cavity with liquid concrete using a pump. Vents can be provided in the header for evacuating air when the cavity is being filled with liquefied concrete so that voids in the finished article are substantially eliminated.