Parabolas can be the only conic sections that are considered functions because they pass the vertical line test. We have worked with parabolas before in quadratic equations, but parabolas formed by conic sections are a little different.
Toilet drainage rough-in steps. 1  Cut a hole in the subfloor just large enough for the bottom part of the toilet flange to sit. 2  If your installing the drainage underground, excavate the trench and have a supply of clean backfill ready (sand or gravel) to grade and cover the pipe.
Installing a Vent Hood on the Roof. Start in the attic and drill a hole through the roof in the desired vent location. Try to keep it close to the fan location. Leave the drill bit sticking through the roof so you can find the hole. From up on the roof, use a jigsaw or reciprocating saw to cut a 4-in. round hole.