What Return Register Size Do I Need For A 110 Cubic Feet Per
Nobody tin 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 (be it flex, metal, round, or rectangular) determines the airflow (measured in CFM).
Instance: How many CFM does a 6-inch duct accept? A rectangular half dozen×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'south pretty obvious.
The smallest six×4 ducts can handle 60 CFM airflow. The biggest 42×12 ducts with 504 sq inch crosssection can 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 5-20 inch diameter).
- Duct sizing chart for metal ducts (circular ducts with 5-xx inch bore).
- four-inch rectangular CFM duct chart (from 6xfour to 24x4 duct sizes).
- 6-inch rectangular CFM duct chart (from 4xhalf-dozen to 30xhalf dozen duct sizes).
- 8-inch rectangular CFM duct chart (from 4x8 to 36xeight duct sizes).
- 10-inch rectangular CFM duct chart (from 4x10 to 40x10 duct sizes).
- 12-inch rectangular CFM duct chart (from 4x12 to 42x12 duct sizes).
You can utilize these ASHRAE duct sizing charts if you're an HVAC technician or a DIY enthusiast:
CFM Sizing Chart For Flex Round Ducts (50-1,700 CFM)
| Duct Size (Inches) | Flex Duct Airflow (CFM) |
|---|---|
| 5 inches | 50 CFM |
| 6 inches | 75 CFM |
| vii inches | 110 CFM |
| eight inches | 160 CFM |
| 9 inches | 225 CFM |
| 10 inches | 300 CFM |
| 12 inches | 480 CFM |
| 14 inches | 700 CFM |
| sixteen inches | 1,000 CFM |
| xviii inches | ane,300 CFM |
| 20 inches | i,700 CFM |
A common question here is "What size duct is needed for chiliad CFM?". If you lot're using flex round ducts, you demand ducts with a 16-inch bore.
Annotation: For everybody using metal duct calculators, you should input Flex duct = .05″ to get an accurate calculation.
If you are replacing rectangular ducts with round ducts, you will have to determine the equivalent diameter of the round ducts. You can find the details about rectangular to round duct transformation hither.
CFM Sizing Chart For Metallic Round Ducts (50-2,000 CFM)
| Duct Size (Inches) | Metal Duct Airflow (CFM) |
|---|---|
| v inches | 50 CFM |
| six inches | 85 CFM |
| 7 inches | 125 CFM |
| 8 inches | 180 CFM |
| nine inches | 240 CFM |
| 10 inches | 325 CFM |
| 12 inches | 525 CFM |
| 14 inches | 750 CFM |
| 16 inches | 1,200 CFM |
| eighteen inches | 1,500 CFM |
| 20 inches | 2,000 CFM |
You can run across that, compared to flex ducts, metal ducts can handle more than airflow. For example, twenty-inch flex ductwork can handle 1,700 CFM airflow while twenty-inch metal ductwork tin handle 2,000 CFM airflow.
Annotation: For everybody using metal duct calculators, you lot should input Round metal pipe = .06″ to get an accurate calculation.
Allow's look at how much airflow rectangular-shapred ducts can handle:
4-Inch Rectangular Ducts Size Nautical chart (60-330 CFM)
| 4″ Duct | 4″ CFM |
|---|---|
| 6×4 | 60 CFM |
| viii×4 | 90 CFM |
| 10×4 | 120 CFM |
| 12×4 | 150 CFM |
| 14×4 | 180 CFM |
| 16×four | 210 CFM |
| eighteen×iv | 240 CFM |
| 20×4 | 270 CFM |
| 22×iv | 300 CFM |
| 24×4 | 330 CFM |
half dozen-Inch Rectangular Ducts Size Nautical chart (60-775 CFM)
| 6″ Duct | half-dozen″ CFM |
|---|---|
| 4×6 | 60 CFM |
| six×6 | 110 CFM |
| 8×vi | 160 CFM |
| 10×6 | 215 CFM |
| 12×6 | 270 CFM |
| 14×6 | 320 CFM |
| 16×6 | 375 CFM |
| 18×6 | 430 CFM |
| 20×6 | 490 CFM |
| 22×6 | 540 CFM |
| 24×6 | 600 CFM |
| 26×half-dozen | 650 CFM |
| 28×6 | 710 CFM |
| 30×6 | 775 CFM |
eight-Inch Rectangular Ducts Size Chart (90-1,500 CFM)
| 6″ Duct | half dozen″ CFM |
|---|---|
| 4×viii | ninety CFM |
| half dozen×8 | 160 CFM |
| 8×viii | 230 CFM |
| 10×viii | 310 CFM |
| 12×viii | 400 CFM |
| 14×8 | 490 CFM |
| 16×8 | 580 CFM |
| 18×8 | 670 CFM |
| 20×8 | 750 CFM |
| 22×eight | 840 CFM |
| 24×8 | 930 CFM |
| 26×8 | 1,020 CFM |
| 28×8 | ane,100 CFM |
| xxx×8 | one,200 CFM |
| 32×8 | 1,300 CFM |
| 34×8 | 1,400 CFM |
| 36×8 | 1,500 CFM |
10-Inch Rectangular Ducts Size Chart (120-2,350 CFM)
| 10″ Duct | ten″ CFM |
|---|---|
| 4×x | 120 CFM |
| 6×10 | 215 CFM |
| 8×10 | 310 CFM |
| ten×10 | 430 CFM |
| 12×10 | 550 CFM |
| 14×10 | 670 CFM |
| xvi×ten | 800 CFM |
| 18×ten | 930 CFM |
| xx×ten | 1,060 CFM |
| 22×x | 1,200 CFM |
| 24×10 | 1,320 CFM |
| 26×10 | 1,430 CFM |
| 28×10 | 1,550 CFM |
| xxx×10 | 1,670 CFM |
| 32×x | 1,800 CFM |
| 34×10 | 1,930 CFM |
| 36×ten | ii,060 CFM |
| 38×10 | 2,200 CFM |
| 40×10 | 2,350 CFM |
12-Inch Rectangular Ducts Size Chart (150-iii,050 CFM)
| 12″ Duct | 12″ CFM |
|---|---|
| 4×12 | 150 CFM |
| half-dozen×12 | 270 CFM |
| eight×12 | 400 CFM |
| x×12 | 550 CFM |
| 12×12 | 680 CFM |
| xiv×12 | 800 CFM |
| sixteen×12 | 950 CFM |
| 18×12 | 1,100 CFM |
| xx×12 | 1,250 CFM |
| 22×12 | 1,400 CFM |
| 24×12 | 1,600 CFM |
| 26×12 | 1,750 CFM |
| 28×12 | 1,950 CFM |
| xxx×12 | two,150 CFM |
| 32×12 | 2,300 CFM |
| 34×12 | 2,450 CFM |
| 36×12 | ii,600 CFM |
| 38×12 | 2,750 CFM |
| 40×12 | 2,900 CFM |
| 42×12 | 3,050 CFM |
All in all, it's of import to empathise what size ducts you need to properly plan the ductwork. You can also check more information virtually CFM and duct sizing in the ASHRAE duct fitting database.
If you're interested in how quickly the air is moving in your ducts, yous tin can employ these two duct velocity calculators. On top of that, if you have the airflow numbers expressed in SCFM (Standard Cubic Feet Per Minute), you can check this SCFM to CFM conversion.
Source: https://learnmetrics.com/cfm-duct-sizing-chart/
Posted by: matapeng1987.blogspot.com
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