Copyright Goodheart-Willcox Co., Inc. 87
5 Basic Duct
Symbols
and Drawings
Chapter Outline
5.1 Duct Systems
5.1.1 Anatomy of a Duct System
5.2 Straight Duct Sections
5.2.1 Duct Section Symbols
5.3 Fittings
5.3.1 Supply Air Fittings
5.3.2 Return Air Fittings
5.3.3 Boots
5.3.4 Transitions
5.3.5 Offsets
5.3.6 Elbows
5.3.7 Tees
5.4 Duct System Accessories
5.4.1 Registers, Grilles, Louvers, and Diffusers
5.4.2 Ceiling Supply Registers
5.4.3 Dampers
5.4.4 Additional Components and Accessories
Learning Objectives
After studying this chapter, you will be able to:
■ Explain the purpose and anatomy of a duct system.
■ Discuss the difference between a plan view and an
elevation view in a duct drawing.
■ Identify various duct fi ttings on a print.
■ Describe the function of duct fi ttings.
■ Identify the direction of intended airfl ow through a duct
section.
■ Identify various air distribution system components
based on their symbols.
■ Determine the intended airfl ow through a duct run based
on print notes.
■ List common duct system accessories.
■ Differentiate between louvers, grilles, and registers.
■ Determine the location of ceiling supply registers, return
grilles, and other system components from prints.