.::. Some Random Terms .::. • Venturi A term used to define a shaped restriction in a pipe where a flowing fluid accelerates under pressure to maintain a constant volumetric flow the same as at other locations in the pipe. .... • Lumber, timbers Any yard lumber 127 mm (5 inches) or more in least dimension. Includes beams, stringers, posts, caps, sills, girders, and purling. .... • Double-fired tiles Glazed tiles produced by an initial firing of the shaped tile body and then a second firing once the glaze or decoration has been applied. ....