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Return Air Duct Size 5 Ton Unit. The Unico return duct UPC-04-. I have one 20x30 return duct with a 20 inch flex duct. For reference we are cooling almost 2000sqft and a majority of the house is vaulted ceilings. Also some filters AIR BEAR and APRILAIRE etc have a model change at five tons.
How To Tell If Your Air Ducts Are Undersized Jenergy Air Services From jenergyair.com
Heat Pump Size Tons Minimum Duct Size Square inches Minimum Return Size Square inches 1 72 200 1 ½ 108 300 2 144 400 2 ½ 180 500 3 216 600 3 ½ 252 700 4 288 800 5 360 1000 M91810 Return air intake non-engineered systems. 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. Your 34x8 supply duct seems to be the limiter at 3 12 tons. 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. Its best to feed a five ton drive from the bottom but if not possible use a wrap around and feed the blower from both sides. For reference we are cooling almost 2000sqft and a majority of the house is vaulted ceilings.
The contractor suggesting 2 12 tons very well may be seeing something that isnt apparent in this thread.
For most systems the minimum duct size see Table 1 is sufficient for up to 25 feet 8 m with no more than three 90 bends. I have one 20x30 return duct with a 20 inch flex duct. Using this approach two 20-in. In a damp climate such as Florida 350 CFM per ton is good. Your return trunk should at least match your supply or even 10-20 percent larger. The Unico return duct UPC-04-.
Source: energycodeace.com
Just my 2 cents but Id want a lot more than 1 - 20x20 return for a 5 ton unit. Your return trunk should at least match your supply or even 10-20 percent larger. A 14 round pipe is equivalent to 750 cfms. The Unico return duct UPC-04-. While a duct sizing calculator built for a specific type of ductwork is the best possible method for sizing ducts the attached chart can be used in most single story homes with a centrally located unit and reasonable length duct runs.
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The return grills would be in the ceiling away from the indoor unit so you would get much quieter operation. For instance a 25 ton system Approximately 400 CFM per ton would require 2 14 flexible return ducts or 1 very short flexible 18 duct. Provided the return grills themselves are adequate it sounds like you have adequate return capacity. If that 14 round return is all you have it is undersized for your unit. Its best to feed a five ton drive from the bottom but if not possible use a wrap around and feed the blower from both sides.
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Im being instructed now to calculate 400-450cfm per ton. A rule of thumb says ducts should carry 400 cubic feet per minute CFM of air for every one ton of cooling. The size of the filter at the air handler gives a clue about the anticipated size of the air return that equipment manufacturer expected to have. A 14 round pipe is equivalent to 750 cfms. When I started in HVAC it was 250-300cfms.
Source: youtube.com
The Unico return duct UPC-04-. Just my 2 cents but Id want a lot more than 1 - 20x20 return for a 5 ton unit. In a damp climate such as Florida 350 CFM per ton is good. From what I am reading I could use another return somewhere else in the house. Your return trunk should at least match your supply or even 10-20 percent larger.
Source: pinterest.com
Your 34x8 supply duct seems to be the limiter at 3 12 tons. For reference we are cooling almost 2000sqft and a majority of the house is vaulted ceilings. 700 feet per minute is maximum velocity in the return ductsminimum air flow is generally 400 CFM per ton or 2000 CFM for your 5 ton unit. You air conditioning and. For most systems the minimum duct size see Table 1 is sufficient for up to 25 feet 8 m with no more than three 90 bends.
Source: pinterest.com
For most systems the minimum duct size see Table 1 is sufficient for up to 25 feet 8 m with no more than three 90 bends. You are only going to get as much air. Using this approach two 20-in. 700 feet per minute is maximum velocity in the return ductsminimum air flow is generally 400 CFM per ton or 2000 CFM for your 5 ton unit. The Unico return duct UPC-04-.
Source: pinterest.com
Its best to feed a five ton drive from the bottom but if not possible use a wrap around and feed the blower from both sides. For most systems the minimum duct size see Table 1 is sufficient for up to 25 feet 8 m with no more than three 90 bends. If that 14 round return is all you have it is undersized for your unit. The size shall be sufficient to return a volume of air compatible with the CFM. Is this sufficient for my unit.
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Also some filters AIR BEAR and APRILAIRE etc have a model change at five tons. Also you want to make sure that the return ducts are the same size as. If its flex its 700. 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. Just my 2 cents but Id want a lot more than 1 - 20x20 return for a 5 ton unit.
Source: in.pinterest.com
Return grilles will be the right choice for a five-ton HVAC system in order to actually deliver 2000 cfm back to the blower without causing the return to hemorrhage. Your filter size at the actual air handler is 20 x 20 400 sq in of air return. I just recently had a new 5 ton 2 stage york package unit installed out in Phoenix during this recent heat wave. Provided the return grills themselves are adequate it sounds like you have adequate return capacity. When I started in HVAC it was 250-300cfms.
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The size of the filter at the air handler gives a clue about the anticipated size of the air return that equipment manufacturer expected to have. FIELD DUCT SIZING CHART Rectangular sheet metal duct 07 on most metal duct calculators Duct Size Duct Height - Net inside dimension in inches ROUND DUCT SIZE ESTIMATE RECTANGULAR DUCT SIZE ESTIMATE 14 5 6 7 8 16 18 20 Design Airflow 50 75 110 9 10 12 1300 1700 160 225 300 480 700 1000 Duct Size 5 6 7 8 18 20 9 10 12 Flexible Duct Round Metal Pipe 750 1200. Your filter size at the actual air handler is 20 x 20 400 sq in of air return. However there could be other factors which may reduce that number. For instance a 25 ton system Approximately 400 CFM per ton would require 2 14 flexible return ducts or 1 very short flexible 18 duct.
Source: pinterest.com
The size of the filter at the air handler gives a clue about the anticipated size of the air return that equipment manufacturer expected to have. Is this sufficient for my unit. Provided the return grills themselves are adequate it sounds like you have adequate return capacity. The Unico return duct UPC-04-. I have one 20x30 return duct with a 20 inch flex duct.
Source: perfect-home-hvac-design.com
The Unico return duct UPC-04-. I just recently had a new 5 ton 2 stage york package unit installed out in Phoenix during this recent heat wave. For reference we are cooling almost 2000sqft and a majority of the house is vaulted ceilings. The contractor suggesting 2 12 tons very well may be seeing something that isnt apparent in this thread. Each in a different location throughout the house.
Source: jenergyair.com
While a duct sizing calculator built for a specific type of ductwork is the best possible method for sizing ducts the attached chart can be used in most single story homes with a centrally located unit and reasonable length duct runs. If that 14 round return is all you have it is undersized for your unit. I just recently had a new 5 ton 2 stage york package unit installed out in Phoenix during this recent heat wave. The return grills would be in the ceiling away from the indoor unit so you would get much quieter operation. For reference we are cooling almost 2000sqft and a majority of the house is vaulted ceilings.
Source: pinterest.com
You air conditioning and. FIELD DUCT SIZING CHART Rectangular sheet metal duct 07 on most metal duct calculators Duct Size Duct Height - Net inside dimension in inches ROUND DUCT SIZE ESTIMATE RECTANGULAR DUCT SIZE ESTIMATE 14 5 6 7 8 16 18 20 Design Airflow 50 75 110 9 10 12 1300 1700 160 225 300 480 700 1000 Duct Size 5 6 7 8 18 20 9 10 12 Flexible Duct Round Metal Pipe 750 1200. For instance a 25 ton system Approximately 400 CFM per ton would require 2 14 flexible return ducts or 1 very short flexible 18 duct. Duct Size - Single Return As for any duct size is dependent on duct length air flow and allowable static pressure drop. Each in a different location throughout the house.
Source: hamiltonhomeproducts.com
FIELD DUCT SIZING CHART Rectangular sheet metal duct 07 on most metal duct calculators Duct Size Duct Height - Net inside dimension in inches ROUND DUCT SIZE ESTIMATE RECTANGULAR DUCT SIZE ESTIMATE 14 5 6 7 8 16 18 20 Design Airflow 50 75 110 9 10 12 1300 1700 160 225 300 480 700 1000 Duct Size 5 6 7 8 18 20 9 10 12 Flexible Duct Round Metal Pipe 750 1200. If only one central return air grill is installed it shall be of proper size. The lower the air volume the more a system dehumidifies. From what I am reading I could use another return somewhere else in the house. The size shall be sufficient to return a volume of air compatible with the CFM.
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So if you have a two-ton system you need ductwork that will carry 800 CFM. Is this sufficient for my unit. Nominal Size in x in Approximately Capacity cfm 10 x 4. A rule of thumb says ducts should carry 400 cubic feet per minute CFM of air for every one ton of cooling. So if you have a two-ton system you need ductwork that will carry 800 CFM.
Source: pinterest.com
Using this approach two 20-in. The lower the air volume the more a system dehumidifies. The size of the filter at the air handler gives a clue about the anticipated size of the air return that equipment manufacturer expected to have. For reference we are cooling almost 2000sqft and a majority of the house is vaulted ceilings. Most technicians are skeptical about these numbers especially on the Return air side of the system.
Source: pinterest.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. For instance a 25 ton system Approximately 400 CFM per ton would require 2 14 flexible return ducts or 1 very short flexible 18 duct. Also some filters AIR BEAR and APRILAIRE etc have a model change at five tons. Duct Size - Single Return As for any duct size is dependent on duct length air flow and allowable static pressure drop. While a duct sizing calculator built for a specific type of ductwork is the best possible method for sizing ducts the attached chart can be used in most single story homes with a centrally located unit and reasonable length duct runs.
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