Should supply air be equal to return air?

Should supply air be equal to return air?

Your return and supply ducts are supposed to maintain a balanced air supply. In other words, there should be an equal amount of air entering and leaving your HVAC system. If there is a difference in pressure, expect comfort and efficiency problems.

How do you calculate return on supply and air?

Example: 200 CFM outside air divided by 2000 CFM of supply air equals 10% outside air. Then subtract the percent of outside air from each return air grille airflow in the system (as calculated above) to find the required adjusted return airflow.

How big should my return air be?

A typical supply vent is 4 by 10 to 12 inches and a typical return vent is 16 by 20 inches or larger. Houses often have two or more return collecting points, each with a filter, which join before re-entering the heating unit.

Where should I put my return and supply ducts?

“An HVAC return air duct should be in every room except a bathroom and kitchen. They should be on interior walls across the room from the supply ducts that should be washing exterior walls with conditioned air.”

Can you have too much return air for furnace?

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.

What happens if your AC return is too small?

If the return duct is too small, there are an inadequate number of return grilles or they are undersized, it can’t return enough air to recirculate back into the system. This poor airflow not only makes your system run longer than necessary to provide comfort, but increases your energy bill as well.

What’s the difference between return and supply vents?

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 to increase return air flow in a HVAC system?

Add More Return Air Inlets & Ducting Adding additional return air inlets and ducts to increase airflow to the air handler is an effective way to improve air conditioning or or warm air heating system performance, provided that the system is in fact running “air starved”.

How big of an air return system do I need for my furnace?

A furnace return system must collect all the air being put out by that system. If the furnace is putting out 1,000 cubic feet per minute of air flow, the return system must collect 1,000 cubic feet and take it back to the unit.

How are return air inlets and ducts improve air conditioning?

Adding additional return air inlets and ducts to increase airflow to the air handler is an effective way to improve air conditioning or or warm air heating system performance, provided that the system is in fact running “air starved”.