How Much Return Air For 3 Ton System
Airflow Calculation Hvac Training Solutions Usa
How much return air for 3 ton system. To calculate the filter grill size divide the airflow CFM by 2. Size of air conditioner example. However for consistent air pressure HVAC professionals recommend one return air vent per room except for the kitchen and bathrooms.
Hello Typically a 16X20 would be fairly standard for most applications on a 3 ton unit. The photograph shows an under-sized single air return for a duct system serving an entire two story home. Return Duct Size for 3 Ton AC.
If that 14 round return is all you have it is undersized for your unit. For every 30 CFM 1 outlets increase the undercut by ½ inch. The return air ducts help pull the air as it is being pushed.
This concern is elaborated next. You need 144 sq in per ton. If we think of changing the air in a space at least 6 times in one hour the HVAC system will need to move 9800 x 6 58800 cubic feet of air per hour.
Everything Ive read on HVAC forums says I need 1200 CFM for a 3 ton unit and that equates to 18 flex duct. Low - 85psi High - 275psi return air temp - 80 deg F and supply air temp - 65 deg F delta temp - 15 I read enough about HVAC designs to be dangerous but I ran a duct calculator program I found on the web site and heres what I found. Under-sized single central air return.
Return grill should be 24x24. Capacities of air return intakes. Many houses especially older homes only have one return vent in a central location which works for a small house about 800 square feet.
In x in Approximately Capacity. Assumed 1200cfm 750fpm 1713in round Return.
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You need 144 sq in per ton.
Use the following formulas. Many houses especially older homes only have one return vent in a central location which works for a small house about 800 square feet. The return air ducts help pull the air as it is being pushed. Ducts were sealed 10 years ago. You have a 3 ton unit which is 1200 cfms. 48000 btus is equal to 4 tons of air flow 12000 btus per ton. The rule for an undercut is very simple. By the 2CFM per sqin rule-of-thumb for AH sizing. Your return trunk should at least match your supply or even 10-20 percent larger.
Calculate the return duct size based on the air conditioners size and the type of duct you are using. Air Return Intakes - Sizes and Capacities pdf Nominal Size. Return grill should be 24x24. Cfm 10 x 4. If that 14 round return is all you have it is undersized for your unit. To calculate the filter grill size divide the airflow CFM by 2. Return Duct Size for 3 Ton AC.
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