What size should my ductwork be?
The size of your duct work depends not just on the size of your entire house but also on the size of each individual room. Thus, one needs to gauge the square footage of the entire house as well as that of all the different rooms in order to decide duct work sizing.
What size duct do I need for 1200 CFM?
16 inches
A rectangular 6×6-inch duct has an airflow of 110 CFM. Bigger 6×12-inch ducts can handle 270 CFM airflow….CFM Sizing Chart For Metal Round Ducts (50-2,000 CFM)
| Duct Size (Inches) | Metal Duct Airflow (CFM) |
|---|---|
| 14 inches | 750 CFM |
| 16 inches | 1,200 CFM |
| 18 inches | 1,500 CFM |
| 20 inches | 2,000 CFM |
What size duct do I need for 2000 CFM?
Rectangular equivalent diameter for air flows between 100 – 50000 cfm.
| Air flow – q – (Cubic Feet per Minute, cfm) (m3/s) | Rectangular Duct Sizes (inches) (mm) x (mm) |
|---|---|
| 1700 (0.77) | 10 x 22 14 x 15 |
| 1900 (0.86) | 12 x 19 14 x 16 |
| 2000 (0.9) | 10 x 25 12 x 20 15 x 16 |
| 2500 (1.13) | 14 x 20 15 x 18 |
How do you calculate CFM for duct size?
Since the size of your ductwork can increase or lower this measurement, you’ll have to find the necessary CFM for each room before you can get the right duct size for each space. Cubic Feet Per Minute = (HVAC Unit Tons x 400) / total square footage of home.
How many CFM is a 12 inch duct?
The rule of thumb for a 12 inch duct is 715 cfm. You would need a 20 inch duct to handle 2000 cfm.
What size duct do I need for a 2.5 ton AC unit?
For instance a 2.5 ton system (Approximately 400 CFM per ton) would require (2) 14” flexible return ducts or (1) very short flexible 18” duct to move the 1000 CFM required by the 2.5 ton system.
What size return should be for a 3 ton unit?
Electric heat pumps shall be tested in accordance with UL 559 or UL 1995. Example: 3.5 ton heat pump. The duct for this system must be sized by using 6 square inches of clear duct area for each 1000 BTU of cooling. Each ton of cooling contains 12,000 BTU.
What size duct do I need for a 12×12 room?
A 12×12 foot room will need a 4×8 inch supply duct to get an adequate CFM rate, which is about 144 CFM.