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Interior of German mechanical fire damper inside of a galvanised steel duct. Fire dampers (or fire shutters) are passive fire protection products used in heating, ventilation, and air conditioning (HVAC) ducts to prevent and isolate the spread of fire inside the ductwork through fire-resistance rated walls and floors. [1]
For example, a 4" pipe, with 1" of thermal insulation makes a 6" penetrant (1" pipe covering on each side of the pipe), plus two pipe sizes = an 8" sleeve, creating a 1" annulus. In case of insulated piping, the size of the insulation must be taken into account for the intended firestop certification listing .
Pipe and duct snips, also known as double cut snips, are a subtype of compound-action snip used to cut stove pipe and ducting lengthwise. The snips have a three-piece jaw that has two side blades that slide against a central blade. This creates a 11 ⁄ 64 in (4.4 mm) wide strip that curls up along the cut.
The scraper in the center of the image is a three corner scraper and is typically used to deburr holes or the internal surface of bush type bearings. Bushes are typically made from bronze or a white metal. The scraper pictured at the bottom is a curved scraper. It has a slight curve in its profile and is also suitable for bush bearings ...
A cleaning pig for a 710-millimetre (28 in) oil pipeline. The blue plastic disks seal against the inside of the pipe to propel the device and to remove loose sedimentation or scale buildup. The black rectangles at the top and the circular disks in the center are magnets to attract and remove any loose metal objects in the pipe.
Related: Jason Kelce and His Daughters Cheer on Their 'Uncle' Zach in Winnipeg Blue Bombers Gear Ahead of the Grey Cup Jason recently shared on the podcast that he and his wife are “very happy ...
A duct with less than 0.75 mg/100m 2 is considered to be clean, per the NADCA standard. [7] A Hong Kong standard lists surface deposit limits of 1g/m 2 for supply and return ducts and 6g/m 2 for exhaust ducts, or a maximum deposit thickness of 60 μm in supply and return ducts, and 180 μm for exhaust ducts. [8]
November retail sales grew from the prior month, reflecting continued resilience in the American consumer and an early sign that the holiday shopping season in the US is off to a strong start.
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