Can I add another return air duct?

A second return duct can lower static pressure if the airflow bottleneck is on the return side. If the static is on the supply side, adding a second return will do nothing. So it’s usually a good idea.

Can you add cold air return?

Although it’s easier to modify cold air return ducts, adding new cold air returns so there’s one in every room is the best way to achieve balanced airflow in your home. This is not a task suitable for the average homeowner, and will likely require a qualified HVAC technician to complete the job.

How much does it cost to add a return air vent?

Generally, a return air plenum will cost approximately $50 to $60 per unit. The other costs to consider are those for the labor and materials needed to install the return air plenum. The installation takes an average of about five hours with the sum of labor costs between $290 and $370.

How do you increase return air flow?

5 Ways to Improve Airflow in Your Home

Check Vents and Registers. One of the simplest things you can do to increase airflow in your home is to check the vents and registers in each room.
Turn on Ceiling Fans.
Schedule HVAC Maintenance.
Consider Duct Cleaning.
Invest in a Ventilator.

What is the return on an AC unit?

What is a Return Air Vent? An air conditioner works by absorbing the warm air and moisture from your home. Once the dampness is separated from the air, your AC unit cools the warm air, and sends it back into your home through the return air vents.

Does every room need a cold air return?

While it is a myth that air return grilles are required in each and every room in the house, it is definitely necessary to have more than one of these grilles installed at strategic places in the house. Likewise, you can also install these in rooms that have a high footfall or usage in the house.

How many AC returns do you need?

Having several return vents (ideally one in every room, but even two or three is better than just one) creates consistent air pressure. If you have one return vent, your home is fine. Keep the doors to each room open so air can properly circulate.

How big of a return air do I need?

A return air grill should be sized for an air speed of 300-500 FPM(feet per minute). 400 FPM is the median air speed for this calculation.

Can I use flexible duct for return air?

Flex duct doesn’t come in an R12 version, so you will have to wrap it. Its fine to use for a return.

Can a return air duct be too big?

Can an air return be too big? No, an air return cannot be too big, except in extreme cases where a closed room is temporarily under negative air pressure. Return vents maintain air pressure, filter out debris, and are critical to the efficient operation of any HVAC system.

How many CFM can a 12 inch duct handle?

CFM Sizing Chart For Metal Round Ducts (50-2,000 CFM)

Duct Size (Inches)	Metal Duct Airflow (CFM)
8 inches	180 CFM
9 inches	240 CFM
10 inches	325 CFM
12 inches	525 CFM

Should supply and return ducts be the same size?

In a rule of thumb sense the return duct should be the same size as all the supply ducts combined. But a rule of thumb is just an initial guide, not anything to bet your comfort on. You have to consider the length of duct and the type of duct.

How many CFM is a 2.5 ton 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.

How many CFM is a 2 ton unit?

800 cfm

What is the standard cfm per ton?

400 cfm

How many CFM do I need for 1000 square feet?

Heat and energy recovery ventilators

Total area of home (square feet)	Continuous ventilation rate
1,000 square feet	50 CFM
2,000 square feet	100 CFM
3,000 square feet	150 CFM

How many CFM do I need for 200 square feet?

CFM is a ft3 per minute unit. That’s why we need to divide the total volume by 60; hence 4,800/60 = 80 CFM….CFM Chart For Common Room Sizes.

Room Size:	CFM (At 2 ACH)
How many CFM do I need for a 100 sq ft room?	27 CFM
How many CFM do I need for a 200 sq ft room?	53 CFM