What Size Ductwork For A 4 Ton Unit
Nobody can properly size the ductworks without a duct sizing nautical chart. HVAC duct sizing chart answers one simple question:
"What size should my ducts exist?"
The dimensions of ducts (exist it flex, metal, round, or rectangular) determines the airflow (measured in CFM).
Example: How many CFM does a 6-inch duct have? A rectangular six×6-inch duct has an airflow of 110 CFM. Bigger 6×12-inch ducts can handle 270 CFM airflow.
The bigger the crosssection of ducts, the bigger CFM ; that'southward pretty obvious.
The smallest 6×4 ducts can handle 60 CFM airflow. The biggest 42×12 ducts with 504 sq inch crosssection tin handle 3000+ CFM airflow.
To figure out exactly how big ducts you need for central air conditioning systems, we have prepared complete CFM duct charts for all different kinds of ducts:
- Duct sizing chart for flex ducts (round ducts with v-xx inch diameter).
- Duct sizing chart for metal ducts (round ducts with 5-20 inch bore).
- 4-inch rectangular CFM duct chart (from 6x4 to 24x4 duct sizes).
- 6-inch rectangular CFM duct nautical chart (from 4xvi to 30xvi duct sizes).
- 8-inch rectangular CFM duct chart (from 4x8 to 36xeight duct sizes).
- 10-inch rectangular CFM duct chart (from 4x10 to 40xx duct sizes).
- 12-inch rectangular CFM duct nautical chart (from 4x12 to 42x12 duct sizes).
Yous can utilise these ASHRAE duct sizing charts if you're an HVAC technician or a DIY enthusiast:
CFM Sizing Chart For Flex Round Ducts (l-1,700 CFM)
| Duct Size (Inches) | Flex Duct Airflow (CFM) |
|---|---|
| five inches | 50 CFM |
| 6 inches | 75 CFM |
| vii inches | 110 CFM |
| 8 inches | 160 CFM |
| 9 inches | 225 CFM |
| ten inches | 300 CFM |
| 12 inches | 480 CFM |
| fourteen inches | 700 CFM |
| 16 inches | ane,000 CFM |
| 18 inches | i,300 CFM |
| twenty inches | 1,700 CFM |
A common question here is "What size duct is needed for 1000 CFM?". If yous're using flex round ducts, you need ducts with a 16-inch bore.
Annotation: For everybody using metallic duct calculators, you should input Flex duct = .05″ to get an authentic calculation.
If you are replacing rectangular ducts with circular ducts, you will accept to make up one's mind the equivalent diameter of the round ducts. Y'all can find the details about rectangular to circular duct transformation hither.
CFM Sizing Chart For Metal Circular Ducts (50-two,000 CFM)
| Duct Size (Inches) | Metal Duct Airflow (CFM) |
|---|---|
| five inches | 50 CFM |
| half-dozen inches | 85 CFM |
| 7 inches | 125 CFM |
| eight inches | 180 CFM |
| nine inches | 240 CFM |
| 10 inches | 325 CFM |
| 12 inches | 525 CFM |
| 14 inches | 750 CFM |
| sixteen inches | i,200 CFM |
| 18 inches | 1,500 CFM |
| twenty inches | 2,000 CFM |
You can see that, compared to flex ducts, metal ducts can handle more airflow. For example, 20-inch flex ductwork can handle ane,700 CFM airflow while 20-inch metal ductwork can handle 2,000 CFM airflow.
Note: For everybody using metal duct calculators, you should input Round metal pipe = .06″ to become an accurate calculation.
Permit'southward wait at how much airflow rectangular-shapred ducts can handle:
4-Inch Rectangular Ducts Size Chart (60-330 CFM)
| four″ Duct | iv″ CFM |
|---|---|
| 6×4 | 60 CFM |
| 8×four | ninety CFM |
| 10×4 | 120 CFM |
| 12×4 | 150 CFM |
| 14×4 | 180 CFM |
| sixteen×4 | 210 CFM |
| 18×4 | 240 CFM |
| 20×four | 270 CFM |
| 22×4 | 300 CFM |
| 24×4 | 330 CFM |
half dozen-Inch Rectangular Ducts Size Chart (60-775 CFM)
| 6″ Duct | 6″ CFM |
|---|---|
| 4×6 | 60 CFM |
| 6×6 | 110 CFM |
| 8×6 | 160 CFM |
| 10×6 | 215 CFM |
| 12×vi | 270 CFM |
| 14×six | 320 CFM |
| 16×6 | 375 CFM |
| 18×6 | 430 CFM |
| xx×6 | 490 CFM |
| 22×6 | 540 CFM |
| 24×vi | 600 CFM |
| 26×vi | 650 CFM |
| 28×6 | 710 CFM |
| 30×6 | 775 CFM |
8-Inch Rectangular Ducts Size Chart (90-ane,500 CFM)
| 6″ Duct | half dozen″ CFM |
|---|---|
| 4×eight | xc CFM |
| 6×8 | 160 CFM |
| 8×8 | 230 CFM |
| 10×8 | 310 CFM |
| 12×viii | 400 CFM |
| 14×eight | 490 CFM |
| 16×eight | 580 CFM |
| 18×8 | 670 CFM |
| 20×8 | 750 CFM |
| 22×8 | 840 CFM |
| 24×8 | 930 CFM |
| 26×8 | one,020 CFM |
| 28×8 | 1,100 CFM |
| 30×viii | one,200 CFM |
| 32×8 | ane,300 CFM |
| 34×8 | 1,400 CFM |
| 36×viii | 1,500 CFM |
10-Inch Rectangular Ducts Size Nautical chart (120-2,350 CFM)
| 10″ Duct | x″ CFM |
|---|---|
| iv×10 | 120 CFM |
| 6×10 | 215 CFM |
| eight×10 | 310 CFM |
| x×10 | 430 CFM |
| 12×10 | 550 CFM |
| 14×10 | 670 CFM |
| 16×10 | 800 CFM |
| eighteen×10 | 930 CFM |
| xx×ten | 1,060 CFM |
| 22×10 | ane,200 CFM |
| 24×10 | one,320 CFM |
| 26×ten | i,430 CFM |
| 28×10 | 1,550 CFM |
| xxx×x | i,670 CFM |
| 32×10 | i,800 CFM |
| 34×10 | 1,930 CFM |
| 36×10 | two,060 CFM |
| 38×10 | 2,200 CFM |
| twoscore×x | ii,350 CFM |
12-Inch Rectangular Ducts Size Chart (150-3,050 CFM)
| 12″ Duct | 12″ CFM |
|---|---|
| 4×12 | 150 CFM |
| 6×12 | 270 CFM |
| 8×12 | 400 CFM |
| 10×12 | 550 CFM |
| 12×12 | 680 CFM |
| 14×12 | 800 CFM |
| 16×12 | 950 CFM |
| 18×12 | 1,100 CFM |
| twenty×12 | ane,250 CFM |
| 22×12 | 1,400 CFM |
| 24×12 | i,600 CFM |
| 26×12 | i,750 CFM |
| 28×12 | 1,950 CFM |
| 30×12 | 2,150 CFM |
| 32×12 | two,300 CFM |
| 34×12 | two,450 CFM |
| 36×12 | 2,600 CFM |
| 38×12 | two,750 CFM |
| 40×12 | 2,900 CFM |
| 42×12 | three,050 CFM |
All in all, it's important to sympathise what size ducts y'all need to properly plan the ductwork. You lot can also bank check more information about CFM and duct sizing in the ASHRAE duct fitting database.
If you lot're interested in how speedily the air is moving in your ducts, you can use these 2 duct velocity calculators. On elevation of that, if you have the airflow numbers expressed in SCFM (Standard Cubic Anxiety Per Minute), you can check this SCFM to CFM conversion.
What Size Ductwork For A 4 Ton Unit,
Source: https://learnmetrics.com/cfm-duct-sizing-chart/
Posted by: nicholscappereen.blogspot.com
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