What Size Duct Do I Need For A 12x12 Room

Installing the duct incorrectly will affect the heating capacity of the system as much as improper sizing.

What size duct do i need for a 12x12 room.

The flex duct size may be different than the hard duct that runs to that room. Never locate ducts at the end of the trunk line run. To accurately gauge the size of your ductwork you ll need to precisely measure the square footage of not just your house as a whole but the size of each room as well. One six inch round duct is good for about 120 cfm a six inch duct carries about 150 cfm and eight inch carries about 200 cfm of cool air.

The duct vent size will depend on the size of the furnace and the size of your home so you know how many vents you need in each room. Install the appropriate duct size connections. Duct elbows square throat no. The size of your home informs the size of your heating and cooling units but it will also determine how large your duct sizes need to be.

Calculate the duct size by using a duct calculator. In order for your forced air furnace to work properly you have to have the right sizes of duct vents in each room expelling air. Use the online duct calculator see references and calculate the needed flex duct size. Also you want to make sure that the return ducts are the same size as the supply ducts.

Last take off run to be located 12 18 from end. You can also do this by checking for them online or by using a manual that is sold by distributors. Select the duct type on the pull down menu. 810 cold air boot collar duct 45 65 el air flow dynamics duct sizing reference guide supply or return duct size capacity 09 to 10 pressure drop per 100 el.

Run the correct size from the furnace and be sure they are installed correctly. 16 up to 11 40 el 12 to 15 55 el 16 to 21 75 el 22 to 27 100 el 28 to 33 125 el return air system no. If a room is 250 square feet the result will be a duct size of 8 inch round. Design cfm 4 cfm 6 cfm 8 cfm 10 cfm 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12 90 8x4 110 6x6 160 6x8 215 6x10 270 6x12 120 10x4 160 8x6 230 8x8 310 8x10 400 8x12 150 12x4 215 10x6 310 10x8 430 10x10 550 10x12 180 14x4 270 12x6 400 12x8 550 12x10 680 12x12 210 16x4 320 14x6 490 14x8 670 14x10 800 14x12 240 18x4 375 16x6 580 16x8 800 16x10 950 16x12 270 20x4 430 18x6 670 18x8 930 18x10 1100.

Input the required cfm in the box below that. For the same 2 5 ton system with a filter grille the grille size would need to be what size asked rick we usually use a 20 x 20 for 2 5 ton said the tech 20 x 20 x 2 800 800 cfm well that s big enough for a 2 ton but a 20 x 25 may be a better choice 20 x 25 x 2 1000. Dampers on take off duct runs allow for adjustments of air distribution. Click calculate and you will see the size of flex duct you need for that room.

Tees split but do not reduce and an appropriate reducer must be added. Once all the rooms are considered for duct size calculations increase the duct size accordingly.