Vent Stack

Related terms

• Water Hammer / Arrestor

  The bang when fast-closing valves stop flow; an arrestor cushions it to protect pipes and joints.

• Variable-Speed Blower

  An ECM blower that ramps output to match demand for steadier temperatures, better humidity control, and lower electricity use than single…

• Water Pressure / PRV

  Household pressure (ideally ~50–70 psi). A pressure-reducing valve protects fixtures where street pressure is too high.

• UEF (Uniform Energy Factor)

  The standardized water-heater efficiency metric for comparing models; higher UEF means less energy per gallon delivered.

• Water Service Line

  The pipe from the municipal main or well to the house. Old galvanized or lead service lines are often replaced during major remodels.

• Two-Stage / Modulating

  Equipment that runs at partial capacity most of the time for efficiency and comfort, ramping up only on extreme days.

• Water Softener

  Equipment that removes hardness minerals to protect pipes, fixtures, and water heaters. Often added during a plumbing remodel.

• Tonnage

  AC/heat-pump cooling capacity (1 ton = 12,000 BTU/hr). Sized by a load calculation, not square footage rules of thumb — oversizing hurts…