Overview of Ductwork:
Ductwork refers to the system of ducts used to transport air from HVAC equipment throughout a structure, contributing to indoor air quality and comfort.
Metal ductwork is the most common type in homes, known for its durability when properly maintained.
Other materials include flexible plastic duct (flex) covered in a metal wire coil and plenums made with fiberglass duct board.
Ducts can be round or rectangular and come in various sizes depending on airflow requirements.
Types of Duct Materials:
Metal Ductwork: Common, durable, and often found in homes.
Flexible Duct (Flex): A plastic material wrapped in a metal coil, used for branch runs.
Fiberglass Duct Board: Often used for plenums, and insulated versions can replace metal ducts for specific applications.
Standards and Codes:
HVAC professionals should be familiar with key industry standards, such as:
Manual D for duct design and sizing.
Manual J for heat loss and heat gain calculations.
Manual T for grills, registers, and diffusers.
International Mechanical Code (Chapter 6) for duct systems.
Reading and understanding blueprints, including plan elevations and section views, is essential for installation work.
Symbols and Specifications:
HVAC symbols, like those for thermostats or solenoid valves, are represented in legends on mechanical plans.
Piping symbols specify details like low-pressure return, chilled water supply, or drain piping.
Ductwork symbols typically include diagonal lines within rectangles to differentiate supply, return, and exhaust ducts.
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