# How big of a return do I need for a 4 ton AC unit?

## How big of a return do I need for a 4 ton AC unit?

You can never have to much return air, as a HVAC contractor you want no less than 144 square inches per ton.

## How big should my AC return be?

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. We are after the ability to move 980CFM so you now divide this number by 400 FPM yielding 2.45 or 2.5. Convert this measurement to inches.

How much return air do I need per ton?

Since the conventional wisdom of designing return grilles at 144 sq.in. per ton is so widely accepted, the average system return is undersized by 30% or more.

How much return air do I need for a 3 ton AC unit?

If the actual airflow is unknown, use 400 CFM for each ton of cooling. A 3-ton heat pump has approximately 1200 CFM of air flow.

### What happens if there is not enough return air?

If there is not enough return air available, your HVAC system will not heat or cool properly. If not enough air is brought back, your HVAC system will not be able to keep up with temperature demands. In some cases, two returns may be necessary to provide enough return air.

### Can you have too much return air?

It isn’t possible to have too many returns.. However, the blower will move only so much air. They must be properly sized — Return air ducts must be large enough to carry a sufficient amount of expended air back to your furnace, air conditioner, or heat pump.

Should return duct be larger than supply?

The return vents in your home suck the air from your rooms into your return ducts and back to your heating and cooling system. Your return vents are typically larger than supply vents, and you will not feel air being blown out of them.

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.

## 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 much return Air do you need for a 4 ton unit?

You can never have to much return air, as a HVAC contractor you want no less than 144 square inches per ton. Regarding the 3.5 TON VS 4 TON The average square foot per Ton is 400 so say the house is 1600 SQFT a 4 TON unit should work great.The Vacuum pump pull 2500 micron is not as important as did it hold at 2500.

What’s the correct return duct size for 4 ton unit?

There seems to be different data on the correct size duct for return sizing on a 4 ton unit. Based on a 4 ton, would a 18″ round flexible duct be sufficient CFM for a 4 ton unit? The return grill size would be 24×30. The run would be approximately 10-15 feet.

How big is a return air conditioner Grill?

(Example: 4 (ton unit) x 144 square inches = 576 squared. The square root of 576 is 24. Therefore, your return air duct and grill size will be 24 by 24 inches.)

### How much does a 5 ton ac unit cost?

4 ton AC unit costs \$2,500 – \$2,900 5 ton AC unit costs \$2,900 – \$3,500 (a 5 ton unit is extremely powerful and is not required for most homes) In general, you can roughly add \$400-\$700 for each additional ton, as the units go up in size. Residential Central AC systems come in a maximum size of 5-ton.