Residential HVAC Installation Practice Exam

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Prepare for the Residential HVAC Installation Exam with this comprehensive quiz. Test your knowledge with multiple-choice questions and get ready to excel in your HVAC installation career.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Up to what diameter does flexible round duct typically come in?

12 inches
18 inches
24 inches
30 inches

The correct answer is: 24 inches

Flexible round duct typically comes in diameters up to 24 inches. This is the standard maximum size for flexible round ducts used in residential HVAC installations. Sizes larger than 24 inches are usually made from rigid duct materials due to the need for structural integrity at larger sizes. Options A, B, and D are incorrect as they exceed the typical maximum diameter for flexible round ducts in residential HVAC installations.