Takeoff and Estimating Glossary

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HEPA (High Efficiency Particulate Air)

HEPA filters are primarily used in spaces where air quality is of particular concern, like hospitals, laboratories, HVAC systems, airplanes, air purifiers, and even some vacuum cleaners, and then also in environments where allergens, pollutants, or airborne particles can affect comfort, health, or equipment performance. HEPA filters, unlike basic air filters which simply remove larger dust particles, are constructed with densely packed fibers that filter much smaller particles as air flows through the filter.

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, helping improve a structure’s stability by resisting lateral forces.

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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