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A direct vent fireplace is a prefabricated metal fireplace that employs a direct-vent combustion system. "Direct vent" refers to a sealed-combustion system in which air for combustion is drawn from the outdoors, and waste combustion gasses are exhausted to the outdoors. "Direct vent" does not simply mean that all gasses from combustion are ...
Direct vent fireplaces are fueled by either liquid propane or natural gas. They are completely sealed from the area that is heated, and vent all exhaust gasses to the exterior of the structure. Chimney and flue types: Masonry (brick or stone fireplaces and chimneys) with or without tile-lined flue.
They are subsequently filled by precipitation of a mineral, typically quartz or calcite. As soon as they form, they begin to rotate in the shear zone. Subsequent growth of the fracture therefore causes the vein to take on a sigmoidal shape. They can be used to determine the incremental kinematics of the deformation history of the rock.
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In weathering, they often change to soft red or yellow claystones, rich in kaolin with secondary quartz. [8] Recent trachyte tuffs are found on the Rhine (at Siebengebirge), [34] in Ischia [35] and near Naples. [36] Trachyte-carbonatite tuffs have been identified in the East African Rift. [37] Alkaline crystal tuffs have been reported from Rio ...
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