3 ton package unit duct size For a 3 ton unit we use 18 inch round returns ducts or 20 12 22 10 and 30 8 rectangular returns ducts These ducts can facilitate at least 1 200 CFM airflow For a 3 5 ton unit we use 20 inch round returns ducts or 22 22 26 10 and
What size return duct do I need for a 3 ton unit A 3 ton unit uses approximately 1200 CFMs or approximately 400 CFMs per ton The lowest you should go is about 350 per ton when the conditions are very humid The table on the right or below if you re viewing on a phone shows the return duct size for HVAC unit from 1 5 tons to 5 tons Based on 400 CFM per ton the corresponding airflow is also provided
3 ton package unit duct size
3 ton package unit duct size
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Air Duct Size Chart
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Return air duct size for 1 5 ton ACs is 14 to 22 for round ducts and 13 x12 to 32 x12 for rectangular ducts Use the return air duct size calculator below for accurate dimensions required for your air conditioner or heat pump For a 3 Ton Unit you will require the following return air duct as a minimum Round Duct Size 18 Diameter Rectangular Duct Options 16 x15 17 x14 20 x12 23 x11 26 x10 29 x9 34 x8 40 x7 Grill Space 600 square inches Note These sizes can be split across multiple return air ducts
A rectangular duct for a 3 ton unit needs to be 254 square inches which is exactly the required size If you can t determine the actual airflow use 400 CFM for each cooling ton For example the airflow rate of a 3 ton heat pump is roughly 1200 CFM Locate your HVAC unit and start by drawing the main duct first Then branch out the duct and extend it until it is close to the respective supply air diffuser The size of the main duct is based on the total airflow or the airflow rated on your HVAC unit For duct sizing you can use online calculators or see my post How to Calculate Duct
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A duct size calculator commonly known as a ductulator depends on factors like the size of the space you re heating or cooling air flow velocity friction loss and available static pressure of the HVAC system Step 1 Look for the data tag on the outside of your condenser outside unit to determine the size of your air conditioner example 3 ton Video of the Day Step 2 Decide if you ll be using round or rectangular duct Step 3 Calculate the return duct size based on the air conditioner s size and the type of duct you are using
Use our ductwork sizing and cost calculator to get the right duct size for your HVAC system Increase efficiency and save on utlitiy bills Duct size or cross sectional area square feet Air volume in cfm can be calculated by multiplying the air velocity by the cross sectional area of the duct in square feet
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3 ton package unit duct size - Locate your HVAC unit and start by drawing the main duct first Then branch out the duct and extend it until it is close to the respective supply air diffuser The size of the main duct is based on the total airflow or the airflow rated on your HVAC unit For duct sizing you can use online calculators or see my post How to Calculate Duct