Takeoff and Estimating Glossary

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Ballast

Ballast is an electrical component that controls currents in certain lights, helping fluorescent lamps start properly and run at the correct power level.

Capacitor

A capacitor stores electrical energy for a short period and releases it when needed. It is commonly used in motors, appliances, HVAC systems, and electronic circuits.

Electrical Conduit

An electrical conduit's main purpose is to route electrical wiring through ceilings, walls, floors, underground spaces, and other exposed areas.

EMT Conduit

EMT conduit (Electrical Metallic Tubing) is a light, steel or aluminum tubing used to protect and route electrical wiring, typically in dry indoor locations.

HEPA (High Efficiency Particulate Air)

HEPA filters remove very fine airborne particles using dense fibers, improving air quality in hospitals, labs, HVAC systems, and purifiers.

GFI Breaker

A GFI breaker is a safety device that supplies power while constantly checking the flow of current, shutting things off immediately if it detects a leak.

VAV (Variable Air Volume)

VAV (Variable Air Volume) is a part of the HVAC system that adjusts airflow to different spaces based on heating or cooling needs.

P-Trap

A P-trap is a U-shaped pipe under plumbing fixtures that holds water to prevent sewer gases from entering buildings.

S/A

S/A, or Supply Air Register, is a part of an HVAC system that brings conditioned air into a room. It directs the air flows, ensuring even distribution and ultimately, how comfortable the room feels.

OS&Y Valve

An OS&Y Valve is a type of control valve commonly used in fire protection and water systems to regulate water flow to the piping network that feeds sprinklers or standpipe systems.

K-Bracing

K-Bracing is part of a structural bracing system where diagonal members connect to a column and beam to form a “K” shape.

NAC

NAC (Notification Appliance Circuit) is an electrical circuit that connects fire alarm systems to notification devices like horns, strobes, and speakers.

EIFS

EIFS (Exterior Insulation and Finish System) is a multi-layered exterior wall system that provides insulation, weather resistance, and a finished surface.

Takeoff and Estimating Glossary

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