Duct System Design and Functionality

The video tutorial covers the design and characteristics of HCA distribution systems, focusing on duct fundamentals, materials, and measurements. It explains insulation types, airflow patterns, and various duct design methods, including velocity reduction and equal friction methods. The tutorial also discusses duct classification, pressure limits, and airflow management, providing insights into design considerations and standards for effective duct systems.

What is the primary purpose of an HCA distribution system?

• To heat the air in a building

• To distribute and manage air flow to design zones

• To cool the air in a building

• To filter the air in a building

Which of the following materials is NOT commonly used for duct construction?

• Aluminium

• Galvanized steel

• Plastic

• Stainless steel

What does CFM stand for in the context of air flow measurement?

• Cubic Feet per Millisecond

• Cubic Feet per Mile

• Cubic Feet per Minute

• Cubic Feet per Meter

What is the purpose of a volume control damper in a duct system?

• To heat the air

• To filter the air

• To control the volume of air flow

• To increase air pressure

Which method of duct design focuses on maintaining consistent friction losses?

• Pressure drop method

• Static regain method

• Equal friction method

• Velocity reduction method

In duct design, what is the typical velocity range for main ducts?

• 750 to 900 fpm

• 300 to 500 fpm

• 1200 to 1500 fpm

• 1500 to 1800 fpm

What is the classification for a duct system with a static pressure of 125 Pascal?

• Class D

• Class C

• Class B

• Class A

Which of the following is NOT a factor to consider in duct construction?

• Color of the duct

• Air flow throw

• Noise level

• Appearance

What is the maximum permissible air leakage for a high-pressure Class C duct?

• 0.08 in of water per 100 ft

• 0.5 in of water per 100 ft

• 1 in of water per 100 ft

• 2 in of water per 100 ft

What is the purpose of using gaskets between duct joints?

• To enhance duct appearance

• To prevent air leakage

• To reduce noise

• To increase air flow