Abstract: To reduce undesirable scrap wastage in fabrication thereof, the rectangular metal frame section of a supply air register is formed from four separate side and end stampings having generally U-shaped cross sections along their lengths, and overlapping corner sections joined at both inner and outer peripheral portions of the frame structure to provide it with enhanced strength and rigidity. Side portions of the side and end stampings form in the frame structure an integral rectangular base section in which the flow rate adjustment damper blade and directional adjustment vane portions of the register are directly mounted to avoid the necessity of a separate support frame structure for these portions of the overall supply air register assembly.

Abstract: A fuel-fired fireplace insert has a compact combination heat exchanger/draft hood structure extending interiorly along its top side and opening outwardly through an upwardly extending flue gas outlet and a dilution air inlet disposed on a top front side portion of the insert. During insert operation, hot combustion gas generated within its fire box portion flows upwardly into the interior of the heat exchanger/draft hood structure, is cooled by room air entering the dilution air inlet, and is discharged through the flue gas outlet. At the same time, room air enters the insert through an opening on a lower front side thereof, is heated by being passed externally along the fire box and the combination heat exchanger/draft hood structure, and is then discharged from the insert back into the room through openings adjacent the dilution air opening.

Abstract: A tank type toilet has a water saving, vacuum-assisted flushing system that incorporates a diverter valve disposed in the tank portion of the toilet. During the flushing of the toilet, pressurized water is discharged from a ballcock valve assembly in the tank and delivered to the diverter valve which creates from the received water a water jet that is used to create a vacuum area within the diverter valve. The vacuum area is communicated with an uppermost interior portion of the bowl trapway to facilitate a main flushing action in the bowl that requires less flushing water. At the same time, the water jet entrains tank water therein, through water inlet openings in the diverter valve body, and delivers the jet and entrained water to the rim flushing passage of the bowl to augment the vacuum-assisted main flushing action.

Abstract: A double wall vent pipe is provided which comprises a first tubular wall that is helically corrugated to form radially outermost ridges spiraled around the outside of the first tubular wall and corresponding first recesses spiraled between the outermost ridges. The vent pipe also comprises a second tubular wall slidably disposed in a concentric relationship with the first tubular wall. The second tubular wall is helically corrugated to form radially innermost ridges which spiral around the inside of the second tubular wall and corresponding second recesses spiral between the innermost ridges. The radially innermost ridges are oriented in a direction oblique to the orientation of the radially outermost ridges such that a space between the first wall and the second wall will be maintained within the first recesses and the second recesses regardless of any bending of the vent pipe.

Abstract: A water closet has a flush tank which reduces the head of flush water presented to a downwardly converging bowl which receives waste to be discharged through an outlet to a siphon trap, the bowl having a rim which causes the flush water to be presented to the trap in a vortex fashion. The trap is U-shaped and includes an upleg and downleg, the upleg having a converging-diverging cross-section to cause the dischrge to be pushed quickly from the bowl into the downleg, which becomes filled and creates a siphon. As waste travels down the downleg it passes through an expansion chamber which imparts a swirling movement to the waste and is again restricted at the outlet, which prevents air from entering the trapway and breaking the siphon.