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Return Duct Size For 2 Ton Unit. Your return trunk should at least match your supply or even 10-20 percent larger. This may be common practice but it doesnt work well at all. Section 9182 states that 2 square inches of duct area is required for each 1000 BTU of output rating. However there could be other factors which may reduce that number.
How To Tell If Your Air Ducts Are Undersized Jenergy Air Services From jenergyair.com
Furthermore should return duct be larger than supply. There are three methods used for most modern duct sizing. A series of equations is used to determine this including duct cross sectional area air flow rate and air speed. Laundry and baths need 4 inch flex. What you really need is a heat-load calculation. So if you have a two-ton system you need ductwork that will carry 800 CFM.
Supply air and return air is always equal because its a closed loop system to the equipment.
The contractor suggesting 2 12 tons very well may be seeing something that isnt apparent in this thread. This duct does an excellent job of absorbing sound from the blower. These are all guesses. Two small bedrooms need 6 inch flex. Return ducts are always larger than supply trunks. This may be common practice but it doesnt work well at all.
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Also you want to make sure that the return ducts are the same size as the. We recently had installed an American Standard 2 ton 14 seer heat pump in an 1100 sq ft basement. Yes I understand that 2 ton gives me 800 cfm. The velocity method takes into account the speed at which air flows through the ducts based on their general size. Note also the Return air grille sizing formula at the top of the chart.
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He installed a 14 by 20 inch return because it fit neatly between the studs. So if you have a two-ton system you need ductwork that will carry 800 CFM. Lg bedroom and living room need either two 6 inch or one 8 inch. A series of equations is used to determine this including duct cross sectional area air flow rate and air speed. Yes I understand that 2 ton gives me 800 cfm.
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This may be common practice but it doesnt work well at all. Metal return duct can be used provided it is. 2 x 85 170 square inches duct size. He installed a 14 by 20 inch return because it fit neatly between the studs. If its flex its 700.
Source: energyvanguard.com
2 ton of cooling is 800 cfm and so on. The contractor suggesting 2 12 tons very well may be seeing something that isnt apparent in this thread. You should use 12 mobile home flex duct for a 25 ton mobile home package unit. And dining room needs 7 inch. Accordingly how many CFM is a 4 ton unit.
Source: hamiltonhomeproducts.com
The duct size for this system will be based upon the output rating of the furnace. The duct size for this system will be based upon the output rating of the furnace. If you need a longer duct add either another sec-tion of the Unico Return Duct or a length of plastic core flex duct between the unit and the Unico Return Duct. Gross area of grille which means 800 cfm of recommended airflow. The unit is multi-staged and when it ramps up the return is very loud.
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Duct Size - How to size a Duct System for a House - YouTube. Furthermore should return duct be larger than supply. 2 ton of cooling is 800 cfm and so on. If that 14 round return is all you have it is undersized for your unit. Return ducts are always larger than supply trunks.
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A rule of thumb says ducts should carry 400 cubic feet per minute CFM of air for every one ton of cooling. Lg bedroom and living room need either two 6 inch or one 8 inch. However there could be other factors which may reduce that number. We recently had installed an American Standard 2 ton 14 seer heat pump in an 1100 sq ft basement. If its flex its 700.
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Return ducts are always larger than supply trunks. The picture just shows that my 12x16 gives me 1000cfm sufficient for my units return maybe. I am measuring inside dimensions. So if you have a two-ton system you need ductwork that will carry 800 CFM. These are all guesses.
Source: jenergyair.com
Using the two cfm for each sqin. 2 ton of cooling is 800 cfm and so on. If the application is not a mobile home package unit you will want to increase that size to 14 mobile home flex. Laundry and baths need 4 inch flex. A rule of thumb says ducts should carry 400 cubic feet per minute CFM of air for every one ton of cooling.
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Gas-fired 85000 BTU2 furnace with a 2 ½ ton air conditioner installed. Nominal Size in x in Approximately Capacity cfm 10 x 4. Yes I understand that 2 ton gives me 800 cfm. Provided the return grills themselves are adequate it sounds like you have adequate return capacity. If you need a longer duct add either another sec-tion of the Unico Return Duct or a length of plastic core flex duct between the unit and the Unico Return Duct.
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Accordingly how many CFM is a 4 ton unit. There are three methods used for most modern duct sizing. So if you have a two-ton system you need ductwork that will carry 800 CFM. He used 8 ft of round flexible ducting to the air handler. Yes I understand that 2 ton gives me 800 cfm.
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If its flex its 700. If you need a longer duct add either another sec-tion of the Unico Return Duct or a length of plastic core flex duct between the unit and the Unico Return Duct. Your 34x8 supply duct seems to be the limiter at 3 12 tons. Accordingly how many CFM is a 4 ton unit. The unit is multi-staged and when it ramps up the return is very loud.
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The picture just shows that my 12x16 gives me 1000cfm sufficient for my units return maybe. Provided the return grills themselves are adequate it sounds like you have adequate return capacity. Gas-fired 85000 BTU2 furnace with a 2 ½ ton air conditioner installed. Also you want to make sure that the return ducts are the same size as the. So if you have a two-ton system you need ductwork that will carry 800 CFM.
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14 inch main flex duct lines which lead to a mixing box. Yes I understand that 2 ton gives me 800 cfm. Contractors dont like to down sell unless there is a pretty good reason. Furthermore should return duct be larger than supply. These are all guesses.
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There are three methods used for most modern duct sizing. These are all guesses. The basement is now finished but I continually questioned the installer on the size of the return. Thats two tons of air not four. Furthermore should return duct be larger than supply.
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If that 14 round return is all you have it is undersized for your unit. He installed a 14 by 20 inch return because it fit neatly between the studs. You should use 12 mobile home flex duct for a 25 ton mobile home package unit. Therefore youll need another 20-in. However there could be other factors which may reduce that number.
Source: hamiltonhomeproducts.com
In the installation instructions is says that the return air duct needs at least 200 or 250 sq inch of free air space in order to work properly. Therefore youll need another 20-in. I am measuring inside dimensions. These are all guesses. The unit is multi-staged and when it ramps up the return is very loud.
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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. If the application is not a mobile home package unit you will want to increase that size to 14 mobile home flex. For the same 25 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 25 ton Said the tech 20 x 20 x 2 800 800 CFMWell thats big enough for a 2 ton but a 20 x 25 may be a better choice. In the installation instructions is says that the return air duct needs at least 200 or 250 sq inch of free air space in order to work properly. He installed a 14 by 20 inch return because it fit neatly between the studs.
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