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There are going to be allot of varying opinions on this one but it's fairly simple to get in a good ball park. You want between 600 to 800 feet per minute of air flow so you need to know the CFM of your air handler and then you can calculate it this way.
Ftcube /min divide by Ft / Min = Ft square. At 1200 CFM for a flow rate of 800 Ft/min you get a result of 1.5 square feet which is 216 square inches. If you divide by 8 for the prefab 8 inch duct you need a 27 inch wide dimension or 16 X 13.5. Good luck on your project.
What else can I help you with?
What size return for a 100000 BTU furnace?
For a 100,000 BTU furnace, the recommended return air duct size typically ranges from 14 to 20 inches in diameter, depending on the specific design and layout of the HVAC system. The exact size may vary based on factors such as the length of the ductwork, the number of bends, and the overall airflow requirements. It's crucial to consult with an HVAC professional to ensure the proper sizing and efficiency of the system.
How do you calculate size of return air grille using cfm?
return grille size times 2 gives u the amount of cfms u are getting out of the return air grille, i.e. 10x10x2=200cfms...
How do you calculate the louver vent size for return air required for an exhaust fan?
quick down and dirty way is the size of your unit (example..4 tons) X 144= the square inches needed for the return vent size or the longer way Max air flow from unit (rated size) / 2.08 cfm/sq in= filter area needed
King vs. California King Sheets?
King size sheets will not fit on a Calfornia king size bed. The fitted sheet will fit but the top sheet will be 4" shorter. A king is 4" longer and a california king is 4" wider.
Do Calvin Klein shoes true size?
Honey, Calvin Klein shoes run true to size about as often as I run a marathon. It really depends on the style and your foot shape, so I'd recommend trying them on before committing. But hey, if you're feeling lucky, go ahead and order your usual size and hope for the best.
Why the return duct of AHU is larger than supply duct?
The air is returning at a lower velocity, so you need a larger size duct.
What is the recommended return duct size for optimal air circulation in a residential HVAC system?
The recommended return duct size for optimal air circulation in a residential HVAC system is typically around 1 square foot of duct area for every 1 ton of air conditioning capacity.
What size duct for cold air return for 3 ton unit?
A 16" round flex duct will accommodate up to a 3.5 ton unit
How big should an air return be how many square inches per square foot of house?
Air return duct and filter grille size is dictated by the size of the unit (CFM) not the size of the house.
What size return air for two and one half ton air conditioner?
8x22 or8x24 duct
What is the recommended return air duct size for optimal HVAC system performance?
The recommended return air duct size for optimal HVAC system performance is typically 1 square inch per 1 CFM (cubic feet per minute) of air flow.
What factors should be considered when determining the appropriate return duct sizing for a residential HVAC system?
When determining the appropriate return duct sizing for a residential HVAC system, factors to consider include the size of the HVAC unit, the layout and size of the home, the number and location of supply vents, and the desired airflow rate. It is important to ensure that the return ducts are properly sized to allow for efficient air circulation and maintain a comfortable indoor temperature.
What is the normal size of pancreatic duct?
what is nomal size of pancreatic duct fir 60 years old male
What is the weight per foot of 22 gauge ductwork?
that depends on what size your duct is as it will vary depending on duct size
How do you clculate 2.5 percent of a number?
Find 5% then half it
What vessel does lymph from the left arm return to the heart through?
Thoracic duct
What size return grille for a carrier-48gp030060311?
To determine the appropriate size return grille for a Carrier 48GP030060311 unit, you'll need to consider the unit's airflow requirements and the size of the existing ductwork. Typically, the return grille size should match or slightly exceed the size of the return duct to ensure optimal airflow. It's usually recommended to consult the unit's installation manual or a professional HVAC technician for specific sizing guidance tailored to your system's configuration and airflow needs.
