the period of time, the sidereal day, during which the earth makes one complete revolution on its axis relative to a particular star. The mean sidereal day lasts 23 hours 56 minutes 4.1 seconds of the mean solar day.
In this corner: a vent stack is series of vertical pipe vents that passes through at least two stories and is meant to maintain atmospheric pressure in the drainage system. The vent stack usually runs parallel with the soil/waste stack and may either extend up through the roof or connect to a stack vent. And in this corner: a stack vent is the uppermost portion of a soil/waste stack that continues the pipe from above the highest connected fixture out the roof.
Heavy Snow Area. 1  26 Ga Metal Panel or heavier. 2  Solid Sheeting. 3  Min 15 lbs felt/ Nova Seal Recommended.  Keep plumbing stacks and chimneys at the peak if 1  possible. Ridge and Eave Closures.  Valley and Hip 1  Closures. Pipe Flashing and Retro fit for stacks.  Profile 1  Roof Vent. Sealer tape on end lapped  panels.