Smoke & CO Alarm Requirements

Related terms

• Soil Stack

  The main vertical drain carrying waste from toilets and fixtures down to the building drain.

• Smart Thermostat

  A learning/Wi-Fi thermostat with scheduling, remote control, and usage reporting; many qualify for utility rebates.

• Static Pressure

  Resistance to airflow in the duct system. High static (undersized ducts, dirty filter) overworks the blower and cuts capacity.

• Smart Switch

  A Wi-Fi/Z-Wave switch for app/voice/scheduled control. Many need a neutral wire in the box — a constraint in older homes.

• Subpanel

  A secondary panel fed from the main, adding circuits for a remodel, addition, garage, or shop. Requires correct 4-wire feeder and isolate…

• Slope / Fall

  Drain pipe must pitch about 1/4 in. per foot — too little won't clear solids, too much drains liquid off solids. A frequent DIY error.

• T&P Relief Valve

  The temperature-and-pressure safety valve on a water heater that prevents tank rupture. Must discharge per code; never plugged.

• Shutoff / Stop Valve

  The local valve at each fixture allowing isolated repair without shutting the whole house. Adding/replacing them is standard during remod…