Ductwork Design and CFM Calculations

The video tutorial by Adam from Prepare for Air covers the basics of residential ductwork design. It emphasizes the importance of running a load calculation before designing ductwork and provides a rule of thumb for airflow requirements. The tutorial includes an example of a three-ton system, explaining how to use duct charts to determine the appropriate duct sizes. Key factors in duct layout, such as accessibility and window placement, are also discussed to ensure efficient airflow distribution.

What is the basic rule of thumb for determining the amount of air needed for a given space in ductwork design?

• 400 square feet per ton of air

• 1000 square feet per ton of air

• 600 square feet per ton of air

• 800 square feet per ton of air

Why is it important to maintain static pressure in ductwork?

• To prevent air leaks

• To increase the lifespan of the ducts

• To ensure efficient airflow

• To reduce noise levels

In a three-ton system, how much CFM is required?

• 1400 CFM

• 800 CFM

• 1000 CFM

• 1200 CFM

What is the CFM capacity of a 12 by 8 rectangular duct according to the duct chart?

• 600 CFM

• 500 CFM

• 400 CFM

• 300 CFM

What is the CFM capacity of a 16 by 8 rectangular duct?

• 900 CFM

• 600 CFM

• 800 CFM

• 700 CFM

How many CFM does a 10-inch flex duct process?

• 400 CFM

• 200 CFM

• 500 CFM

• 300 CFM

What is the total CFM needed for a system with a 10-inch and a 6-inch flex duct?

• 700 CFM

• 400 CFM

• 600 CFM

• 500 CFM

Which factor is NOT mentioned as influencing ductwork layout?

• Layout of the space

• Accessibility

• Color of the ducts

• Windows

What is the purpose of placing supplies near windows in duct design?

• To enhance the aesthetic appeal

• To block out noise from outside

• To prevent heat infiltration

• To improve air quality

Which of the following is a key consideration when deciding on ductwork layout?

• The presence of sharp corners

• The number of windows

• The type of flooring

• The color of the walls