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1900 Second 72-inch main from Pipe Head to Potts Hill. 1905 Additional trunk feeders added from Potts Hill: 1 x 30-inch, 24-inch, 20-inch from Potts Hill to the western suburbs and Drummoyne; 1 x 15-inch off the 72-inch main above Potts Hill at Woodville Road to supply part of Granville; 1 x 18-inch from Potts Hill to supply Rookwood
An H-style cap is a chimney top constructed from chimney pipes shaped like the letter H. It is an age-old method of regulating draft in situations where prevailing winds or turbulences cause downdraft and back-puffing. Although the H cap has a distinct advantage over most other downdraft caps, it fell out of favor because of its bulky design.
A ridge vent is a type of vent installed at the peak of a sloped roof which allows warm, humid air to escape a building's attic. Ridge vents are most common on shingled residential buildings. Ridge vents are also used in industrial warehouses to help release the hot air and help circulate comfortable air inside the building .
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Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.
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