## How much CFM can a duct handle?

The smallest 6×4 ducts can handle 60 CFM airflow. The biggest 42×12 ducts with 504 sq inch crosssection can handle 3000+ CFM airflow….CFM Sizing Chart For Metal Round Ducts (50-2,000 CFM)

Duct Size (Inches) Metal Duct Airflow (CFM)
12 inches 525 CFM
14 inches 750 CFM
16 inches 1,200 CFM
18 inches 1,500 CFM

What size ductwork do I need for 1200 CFM?

Duct Size Chart

Duct Airflow (CFM) Round Duct Rectangular Duct
800 14″ 18×8
900 14″ 16×10
1,000 14″ 16×10
1,200 16″ 20×10

### What size duct do I need for 6000 CFM?

USING THE CFM/FPM CHART:

Air Volume in Ducts in Cubic Feet per Minute (CFM)
2000 6000
6 395 1180
7 535 1605
8 700 2095

How many CFM is a 6 round duct?

“For example, most techs will tell you that a 6” duct will provide about 100 CFM.”

## What size ductwork do I need for a 5 ton unit?

A common 5 ton system would be 2000 CFM (400 CFM per ton) so a 24×30 register or grill (-. 02″ sp) with (10) feet of 24×12 duct (-. 092″/100′) with a duct transition to the RA opening of the unit (if duct is needed) would be a fairly low loss system.

How do you calculate the CFM of a duct?

CFM calculation requires the size of your HVAC unit in tons to be multiplied by 400 (the average output of an HVAC unit). The total must then be divided by the square footage of your house. The air flow from your system also depends on the rate of friction loss of ducts. 2000 cfm (0.94 m3/s) of air flows through a 10 x 12 inches rectangular duct.

### How do you calculate CFM for ductwork?

Duct sizing chart for flex ducts (round ducts with 5-20 inch diameter).

• Duct sizing chart for metal ducts (round ducts with 5-20 inch diameter).
• 4-inch rectangular CFM duct chart (from 6x 4 to 24x 4 duct sizes).
• 6-inch rectangular CFM duct chart (from 4x 6 to 30x 6 duct sizes).
• 8-inch rectangular CFM duct chart (from 4x 8 to 36x 8 duct sizes).
• What size duct for 1200 CFM?

If your hood is between 901 and 1200 CFM, then you should go for a minimum duct size of 8”, and if you have a 1200 CFM hood, consider going for a minimum duct size of 10”. Range Hood Duct Length . After paying attention to your duct’s diameter size, the next thing you have to consider is its length. With a good duct length, you can be able to exhaust the cooking air effectively even if your ductwork is undersized. Things to Consider When Assessing Your Duct Size and Design

## How many CFM in a 6 inch round duct?

How many CFM is a 12 inch round duct? 2000 cfm (0.94 m3/s) of air flows through a 10 x 12 inches rectangular duct. The friction loss according the table above is 0.81 inches water gauge per 100 ft duct (aprox. 6.6 Pa/m). The velocity in the the equivalent 12 inch circular duct according the table above is 2589 ft/min (13.2 m/s).