Abstract: Perimeter and transverse troughs, possibly 3-5 inches wide and deep, can be formed in an existing building subterranean concrete floor, with the perimeter trough being immediately adjacent and extended along the foundation wall and the traverse trough connecting the perimeter trough to a nearby sump pit formed in the floor. Each trough can be formed by cutting narrow shallow grooves outlining its desired location, and then breaking away the concrete there between. Water seepage through the wall will collect in the perimeter trough and drain away via the transverse trough to the sump pit, eliminating water pooling on the building floor itself. The troughs can be covered by separate metal or plastic covers, secured by adhesives, sealants and/or nails relative to the floor and/or foundation wall.

Abstract: The disclosed planar vapor barrier is comprised of three thin planar sheets sandwiched fixedly together. One outer sheet is of aluminum foil, with a very thin reinforcing film of polyethylene on its outer face. The other outer sheet is of plastic, preferably with embedded reinforcing filaments. The middle sheet is of a foamed plastic. The outer sheets can have generally similar thicknesses, while the middle sheet can be significantly thicker. The entire planar vapor barrier can between 0.01?-0.05? thick. The planar vapor barrier is durable and tough, and most effective when spread over a dirt crawl space floor for blocking ground vapors from entering the building. To cover larger areas, several different planar barriers can be laid out to overlap at adjacent edges, whereby tape can secure the adjacent edges together.

Abstract: The disclosed inventive system vents Radon gas from a building crawl space disposed below ground level floor, where such gas can enter via a dirt floor or the like. An impervious sheet is spread over the floor and up the adjacent foundation walls, and is sealed to the wall near its top, thereby isolating Radon gas from the crawl space. A thin porous mat extends to the wall spread between the floor and sheet operable to direct the collected Radon gas to the wall. A perforated pipe encircles the crawl space and overlies the mat at the wall, and is vented by a solid wall pipe to the outside atmosphere, thereby effectively removing the Radon gas from the crawl space.

Abstract: A digital gas flowmeter is described as follows: the flowmeter can measure gas flow by digital signal, a optical or magnetic sensor can sense the rotation of a wheel rotating by the pressure of gas that enters into a gas chamber built in the flowmeter; the measure mode can be programmable in on-chip CPU; the digital gas flowmeter includes a gas chamber, which formed by shell, wheel, rotor sensor, gas-in sensor, cone shaped gas-in tube and gas-out tube. The rotor sensor connects with a programmable on-chip CPU, with the rotor sensor recognizes the rotation mechanical signal of the wheel in gas chamber, and converts mechanical signal to digital signal and sends to CPU; this signal can be processed in certain modes programmed by CPU and CPU sends the final result data of gas flow to a display device showing gas usage.