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. How many CFM is a 3 ton unit? 1200 CFM. 350 to 400 CFM per ton of cooling is required for proper air conditioning system operation. For example, if you are checking a 3 ton system, the airflow required is … Multiply it by 144 to get the grille size in square inches and choose your preferred grille size based on that. For instance, 400 cfm ÷ 350 x 144 = 164.57 sq.in. So, the possible grille sizes are 20×8 (160 sq.in), 16×10 (160 sq.in) or 14×12 (168 sq.in) depending on your duct size. The above way is based on the grille sizing formula which: Heat strip would be sized to 80% of 27,230 = 21,790 BTU/HR = 6 kW per ACCA Manual J practice. Two 3 kW heat strips would be practical to handle the Aux Heat down to 10'F with a 2-ton 10 HSPF rated heat pump. Auxiliary heat (one 3 kW strip operating) would typically be necessary at > 22'F and < 34'F.8″, 10″ & 16″ all have the same price-point at $23 for a 50ft roll. These three sizes are great choices if you want to save money on your utility bills but still make sure that your mobile home has the perfect amount of airflow. The 14″ flux duck is more expensive than 8″, 10″ & 16″. It costs $33 for the same length which means ...QUICK-GUIDE. Select the duct material from the drop-down list (most duct sizing tools are typically based on galvanised steel ducting by default) Enter the air flowrate in cubic feet per minute (CFM) Enter an internal duct size in inches (this must be limited to a maximum aspect ratio of 5:1 for the results to be valid) The resulting velocity ...NFPA 72 also states that a duct smoke detector is not allowed to replace an area smoke detector, mainly because if the air-handling unit (AHU) is not running, the detector would not detect smoke. Therefore, duct smoke detectors are typically considered mechanical equipment devices instead of life safety devices.For a three-ton unit, you will require an 18″ round air duct size for your ductwork. If you intend to use a rectangular air duct, you need a ductwork size of …Very warm winter climates (Average low winter temperatures of 35 degrees and up) 1.5 - 3.0 tons Heat Pump - Use a 5 Kw. 3.5 - 5.0 tons Heat Pump - Use a 10Kw. Mild winter climates (Average low winter temperatures of 25 degrees and up) 1.5 - 2.0 tons Heat Pump - Use a 5 Kw. 2.5 - 5.0 tons Heat Pump - Use a 10Kw.As the summer months approach, many homeowners find themselves in need of an air conditioning system that can keep their living spaces cool and comfortable. One crucial aspect of e...highlights. The Goodman® GPH14M 14 SEER Packaged Heat Pump provides energy-efficient cooling and heating performance in one self-contained unit. The Goodman GPH14M is housed in a heavy-gauge, galvanized-steel cabinet that offers a high-quality, UV-resistant powder-paint finish and allows for a ground-level or rooftop mount.Frequently Asked Questions. What return duct size do I need for a 2 Ton unit? For a 2 ton unit you can use either a 19″ flex duct or one of the following rectangular ducts: 14″x13″, 15″x12″, 17″x11″, 18″x10″, …There are 12,000 Btu's per ton. The number 24 in the model number indicates the unit is 24,000 Btu's, divided by 12,000 Btu's per ton, equals 2 tons. 24,000 Btu's/12,000 Btu's per ton = 2 tons. Use the following conversion information to determine your existing system size (use the system model number NOT the serial number) 18 = 1.5 tons.Sep 30, 2021 · September 30, 2021. Sky Heating’s HVAC Ductwork Sizing Guide. The right sized ductwork ensures your HVAC system will work efficiently. If the ducts are too small, the system will work harder and use more energy; oversized ducts will reduce air velocity, and you might not know air is venting into rooms. HVAC ductwork sizing involves using a ... The line set run will be 85 feet. I beliieve I should install a 1 1/8 suction line for the 3 ton unit. At least I believe if I install a new 16+ SEER system with a 85 ft run it will rrequire a 1 1/8 inch suction line. Since copper is so expensive I was hoping to reuse it when I switched from R-22 to R410A with the new system.The Goodman® GSX16 UP TO 16 SEER Central Air Conditioner uses the environmentally friendly refrigerant R-410A and features energy efficiencies and operating sound levels that are among the best in the heating and air conditioning industry. R-410A is chlorine-free to help prevent damage to the ozone layer. The GSX16 features a high-efficiency Copeland® scroll compressor and is designed ...HVAC Unit Sizing Chart with CFM per ton and starting supply and return size Notice that the CFM values in the above table are listed as a range. Whether your system flows at the minimum or the maximum of this range is dependent on the system’s friction loss as well as the equipment chosen.Furthermore, without a return air duct in each major room, the supply duct air has to "push" all of the air in the room out of the way as it makes its way towards you. The return air ducts help pull the air as it is being pushed. An HVAC return air can be in the floor, but they work much better on walls up about 7 feet.Helping you plan your home improvement project, from start to finishWhat Size Ducts Should My Return Air Be? The size of return air ducts should be based on the size of the heating and cooling system that they are connected …This duct size should be adequate for 5 tons. However, because of the fittings they used and their equivalent length (EL), the furthest 3 ...What size return air grill for a 48000 BTU heating system? 48,000 btus is equal to 4 tons of air flow, 12,000 btus per ton. You need 144 sq in per ton.What size duct do I need for a 12×12 room? ... How many CFM is a 5 ton unit? For a rough estimation, a 5-ton unit might require around 2000 CFM (400 CFM per ton). ... How big should a supply vent be? Supply vent size depends on factors like room size and required airflow. Common sizes include 4×10 or 6×10 inches.By using this equation, we can determine the size of the return grille we need for 400 CFM airflow like this: Grille Area (400 CFM) = 400 CFM ÷ 500 FPM ÷ 0.7 × 144 = 164 Sq In. That means we will need a grill with at least 164 square inches of area to accommodate for a 400 CFM airflow. 10×10 grille, for example, has a 100 sq in area; it ...Helping you plan your home improvement project, from start to finishHi, I have a 5 ton a/c unit cooling just shy of 2,000 sq ft. My air return is built into a sealed box positioned between 2 walls at the bottom of the second floor. ... 2 to 3 feet of horizontal duct, and another 90 degree elbow to connect the duct to the unit. Thanks for your help! ... I am trying to figure out what size supply trunks, return ...Ruud by Rheem 3.5 Ton 16 Seer Air Conditioning System is available to buy in increments of 1 . Accessories. ... Supply duct flanges provided as standard on air handler cabinet. ... 35 3/4 : Indoor Unit Height (Inches) 50 1/2: Indoor Unit Width (Inches) 21:We are replacing a gas pack that is currently a 2 ton Trane and going with a goodman 2.5 ton unit. The air supply and return lines (tubes) under the house both say 14" on them. Was told by a contractor over the phone that based on my s.f. (1380 s.f.), that the 2 ton is undersized. It runs forever during the summer and the house really never heats up well in the winter.duCt Size 01-510-16 01-515-16 47 5/8 23 5/8 13 1/2 21 45 22 1/2 11 1/4 10 1/2 16 RD 01-510-18 ... • Units are fully insulated (both supply and return). ... SUppLy DUCT ThROUGh RETURn TRAnSITIOn (15 TOn AnD LARGER) DOUBLE DEFLECTIOn GRILLS BUILT In TURnInG vAnE. Typical specifications Furnish and install Ruskin Rooftop Systems “530 … Rectangular sheet metal duct = .07" on most metal duct calculators. 2900. 40x12. 100 31/2 x14 2200 38x10 220 31/2 x30 2350 40x10. Rectangular sheet metal duct = .07" on most metal duct calculators. 3050. 42x12. Buy O General Duct Air Conditioner 3 TON ARGA36FMTA-U online at the best price in UAE from Sharaf DG. Shop from a large selection of Air Conditioners, Cooling & Heating, Home Appliances, Window Air ConditionersPost Likes. The (minimum) rule of thumb is 5 outlets per ton. A long supply run will have an effect on the airflow it can deliver. The last Unico (or it may have been a SpacePac) I bid needed to have the "plenum" enlarged from the original 7" to 9" and then I need to re-route some of the supplies off of the 9".For a three-ton unit, you will require an 18″ round air duct size for your ductwork. If you intend to use a rectangular air duct, you need a ductwork size of 16″x15″ to 40″x7″. The ductwork size plays an essential role in the efficiency of your HVAC unit.For LRP Horizontal 2 to 3 Ton Units (1) For LRP Horizontal 3.5 to 5 Ton Units ... Duct Size: (2) (Dia.) 20" (1) + Show More - Show Less; Sort By. Sale Clearance. Lennox RTD9-65-R, Step-Down Ceiling Diffuser ... Lennox C1DIFF31B-1, 104509-01, Supply & Return Air Transition Kit, For LG/LC/LH/LD/KG/KC/KH 210, 240 Units. Cat #: 12X70 Model/Part #: ...When added to an existing forced-air heating system, central air for a 2,000-square-foot home costs $3,500 to $4,000 and can be done by two technicians in two to three days, often with little or no change to the ducting. For a house that needs ducts, the costs and work time double.Recommended airflow is typically 400 cfm per ton of AC. A 3 ton AC would therefore need 1200 cfm airflow. With only 423 sq in of return your air velocity through the grille would be just over 400 ft/min, a good number as far as noise is concerned. Air velocity of more than 500 ft/min will be too noisy for a residential system.2. Rigid Duct. Apart from the air conditioner itself, the rigid ducts is the largest component in a ducted air conditioning system. The rigid duct is usually made of galvanized iron at about 0.5mm to 1.0mm thickness depending on the duct size. The entire rigid duct must be insulated to prevent condensation.baytemspfg1a/b supply duct flange kit tem6a0b24–tem6a0d60 ... unit size (tons) speed setting airflow setting dip switch setting airflow power external static pressure 2 ton 3 outdoor 2 ton. 22-1907-1e-en ton. tem6a0b24h21s, tem6a0b30h21s tem6a0c36h31s, tem6a0c42h41s. handler. heat.Our previous 5 ton unit only had a 16x16 (leading to a 12 inch round) and a 12x12 (leading to a 8 inch round). We had many issues with our previous unit which i believed to be linked to our low return air duct sizes. In the 15 years we owned that unit we had to replace the condensor 3 times (about every 5.Air Flow 8,000 cfm @ 1.5" ESP Voltage 460 V / 3 phase / 60 hertz Supply Air Duct (2) 20" Disconnect Size Return Air Duct (2) 20" Connection Leviton Series 16 Camlock Metal ... Unit Arrangement - Dimensions are Approximate 20 TON AIR CONDITIONER2 ton AC unit costs $1,700 – $2,200 3 ton AC unit costs $2,200 – $2,500 4 ton AC unit costs $2,500 – $2,900 5 ton AC unit costs $2,900 – $3,500 ( a 5 ton unit is extremely powerful and is not required for most homes) In general, you can roughly add $400-$700 for each additional ton, as the units go up in size. Residential Central AC ...Helping you plan your home improvement project, from start to finishHelping you plan your home improvement project, from start to finishhighlights. The Goodman® GPH14M 14 SEER Packaged Heat Pump provides energy-efficient cooling and heating performance in one self-contained unit. The Goodman GPH14M is housed in a heavy-gauge, galvanized-steel cabinet that offers a high-quality, UV-resistant powder-paint finish and allows for a ground-level or rooftop mount.Take the first step towards comfortable, energy-efficient, and stress-free living by scheduling a consultation with Sandium. Get a consultation. (408) 894-9072. Sandium offers amazing HVAC services including ductwork sizing, AC system installation, and professional HVAC cleaning. Trust our experts for your HVAC unit needs.Note: On July 1, 2017, Table 6.2.4.2. of Division B of the Regulation is amended by striking out "single dwelling units" in Column 1 of Item 1 and substituting "an individual dwelling unit in a building other than a house", striking out "Round" in Column 1 of Item 2 and substituting "Round ducts serving a house or an individual dwelling unit in a house" and striking out "for single dwelling ...13 Aug 2003 ... How much of the system is returned through this duct? A starting place would be about 100 square inches/ton of cooling (i.e. 12x8 or 10x10).With the entire DuctSox system acting as a diffuser, air dispersion and distribution is combined allowing simple and efficient layouts that typically cost 20-80% less and outperform comparable metal duct systems. Not every application is a straight line of DuctSox. To accommodate this, we offer a variety of standard fittings.From my A/C supply plenum, I will have a trunk (approx 20ft straight run) with 3 branches coming off (each about 2 ft runs). This 20ft straight run would be perfect for a large flexible duct, and ductwork wyes are available to create the smaller branches. Multiply it by 144 to get the grille size in square inches and choose your preferred grille size based on that. For instance, 400 cfm ÷ 350 x 144 = 164.57 sq.in. So, the possible grille sizes are 20×8 (160 sq.in), 16×10 (160 sq.in) or 14×12 (168 sq.in) depending on your duct size. The above way is based on the grille sizing formula which: For floor registers, they follow the same rules as return grilles, where you state the dimension parallel to the louvers first. This means that floor registers will often have a smaller number first, like 4×10 or 4×12. Ceiling and some sidewall registers will usually just be described as long side first, such as a 10×6 or 12×8, but that can ...Field convertible airflow (3 - 15 ton). Being able to convert a unit from vertical airflow to horizontal makes it easy to overcome job site complications. 15 ton models require a simple supply duct cover to field convert from factory vertical to horizontal. Easy-adjust, belt-drive motor available. Provisions for bottom or side condensate drain.Step 3. Calculate the return duct size based on the air conditioner's size and the type of duct you are using. Use the following formulas: For rectangular duct: Size of air conditioner (example: 4 tons) x 144 square inches = return air duct in square inches. For round duct: Diameter of duct x 3.14 = return air duct in square inches.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, …AC Registers per Room. Under basic guidelines, HVAC experts recommend at least one AC register or duct per room. But number this isn't set in stone, as some owners may prefer more than one register for better airflow. The overall size of the house, the size of the room and the numbers of window in the room all play a part in determining the ...How Much Does an HVAC Replacement Cost in 2024? Average Cost Range: $6,465 - $11,877. Use the calculator below for a more accurate local estimate. Use Modernize's 2024 cost calculator to get accurate HVAC replacement cost. Get local price ranges by zipcode for cooling, heating or both!Duct smoke detectors work by sampling air currents in air handling equipment to determine if smoke or fumes are present. When either is detected, the device will close the dampers on the duct, shut down the fans and blowers to eliminate the oxygen source to help prevent the fire's spread, and trigger an audible and visible signal at the fire control panel.July 29, 2022 | By Rene Langer. 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 …The furnace is way overpowered for the size of the house -- 130,000 btu whereas our needs are about 80,000 btu. An 80k btu furnace would give us a "3 ton blower," but because our current A/C unit is 4 tons, I'm told, this will be a mismatch. What is confusing me is the precise consequences of the mismatch.Our ducted AC units are an ideal choice for hotels, restaurants, hospitals, resorts, villas, offices etc. What is Ductable air conditioning? A ducted air-conditioning installation is a type of central air conditioning that consists of an air distribution system that is carried out through a series of tubes installed in the false ceiling of the home or premises.September 30, 2021. Sky Heating’s HVAC Ductwork Sizing Guide. The right sized ductwork ensures your HVAC system will work efficiently. If the ducts are too small, the system will work harder and use more energy; oversized ducts will reduce air velocity, and you might not know air is venting into rooms. HVAC ductwork sizing involves using a ...When our technicians talk about tonnage, it means how much heat an air conditioner can remove from a home in one hour, which we measure in BTUs (British Thermal Units). An air conditioner that is one ton is able to remove 12,000 BTUs of heat per hour. Each ton is an additional 12,000 BTUs.The return grill size would be 24x30. The run would be approximately 10-15 feet. Thanks! In many cases 18" will be large enough. But I can't see how its being installed in your home to know for sure. However, a 24x30 return grille …In short, there's two prevailing standards that determine whether duct detection is required. The first (and most common in the United States), is the International Mechanical Code (IMC). Section 606.2 identifies areas where smoke detection is required for the purpose of mechanical unit shutdown. The other prevailing standard is NFPA 90A, the ...The size of the plate from bottom and flange from back is the same, it is easy for installer to change the air intake from back to bottom. ... MTA-36WN1/MOVTB-36CN1-13C (3.0 Ton - 36000 BTU) MTA-48WN1/MOVTB-48CN1-R13C (4.0 Ton - 48000 BTU) ... Good Air LLC supply of O General and Midea air conditioners. Installation and Maintenance of all kind ...How Much Does an HVAC Replacement Cost in 2024? Average Cost Range: $6,465 - $11,877. Use the calculator below for a more accurate local estimate. Use Modernize's 2024 cost calculator to get accurate HVAC replacement cost. Get local price ranges by zipcode for cooling, heating or both!Old system: Carrier 3 ton AC with 3.5 ton (1400 cfm's) Carrier 80% eff furnace. In the unfinished basement. New system: Trane 3 ton XL15i with 3 ton (1200 cfm's) 60K XV95 2 stage (58K/37.7K) with 5" media filter cabinet. During the bidding process, I asked sales folks about the adequacy of our ducts (all insulated and flexible).Self Contained Package Units. 1.5 Ton - 2.0 Ton ; 2.5 Ton - 3.0 Ton; 3.5 Ton - 5.0 Ton; Ultra Low NOx for California; Mobile Home Systems. AC/Electric Heat; ... Use the AC Unit sizing calculator below to calculate your required central air conditioner and heating system tonnage size. Follow these easy steps: Select the region you live in ...The first stage of a gas heat Sun™ Pro unit provides 70% or 75% of the heating capacity for the 3 to 5 ton units. The 6.5 to 12.5 ton units reach 60% heating capacity on the first stage. Convertible airflow design A convertible airflow design provides maximum field flexibility while minimizing inventory. The side ducts are covered when the ...Step 1: CFM – System Size & Blower Size. Sizing an HVAC System. Step 2: Maximum Friction Rate. Friction Rate and Ductwork Length. What is TEL? Step 3: Maximum Velocity. Summary of Ductwork Sizing Factors. Our Recommendation. The Pick HVAC Ductwork Calculator.Round duct and rectangular duct comparison. A round duct with a cross sectional area of 0.6m2 has a perimeter of 2.75m. A rectangular duct with an equal cross sectional area has a perimeter of 3.87m. The rectangular duct therefore requires more metal for its construction, this adds more weight and costs to the design.The static pressure caused a windstorm in each room. I had two more supply ducts added, and the rest of them increased to a larger size (probably 9" or 10" flex) to lower the static pressure. The 3 ton system has finally quit (compressor locked rotor amps), so I'm looking at replacing it with a 2 ton system (per Manual J calcs).thermostat's call with the zone dampers in the ducts and the HVAC Unit. In some instances a by-pass damper or duct maybe required to relieve excess air when smaller zone(s) are the only ones calling. ... zones depending upon the size of the building. Most commonly a home is at least 2 zones, those being the living room, kitchen on one zone ...Oct 1, 2023 · What size ductwork for a 3.5-ton unit? For a 3.5-ton HVAC unit, you would typically use ductwork that can accommodate the required CFM while maintaining proper air velocity. Refer to HVAC duct sizing guidelines for sizing details. How many CFM do I need for a 3-ton unit? A 3-ton HVAC unit typically requires around 1,200 to 1,400 CFM of airflow ... Adicot, Inc.'s Duct Size Calculator is a versatile and powerful tool designed to assist professionals in the HVAC (Heating, Ventilation, and Air Conditioning) industry. Whether you work with metric or English units, this calculator can handle both, providing convenience and flexibility for users worldwide. Modeled after the renowned original ...In most cases, if you are installing ducts in each room where there is a supply, you will want to go with the same size as your supply vents. If you are installing just one or two return vents, you will want to go with a 12-inch return for 2-ton units and lower. 14- inches for 3 and up. 16-inch should be suitable for 4 ton systems, whereas 5 ...19 Jan 2021 ... Understanding the procedure of reducing the size of an air duct based on sound principles, not rules of thumb. Proper Duct sizing, no rules ...In the HVAC world, "rules of thumb" often dictate equipment sizing. Using a common rule of thumb mandating 1 ton of cooling capacity for every 600 square feet, a contractor might look at a house and say, "Ok, this one's 2,400 square feet. Cool, dude! Let's put in a 4-ton air conditioner.". Not cool, dude.HVAC ductwork sizing involves using a complex formula. To simplify things, here is a general overview of how ductwork size is calculated: (503) 673-9083 Schedule now. Get Filters. ... Cubic feet per minute is calculated by multiplying the size of the HVAC unit (in tons) by 400. Divide the answer by your home’s square footage to find out total ...
36,000 BTU 3 Ton 17.5 SEER2 Ductless Mini Split Air Conditioner Heat Pump Variable Speed DC Inverter+ System 208/230V. Add to Cart. Compare. More Options Available $ 5499. 00 /bundle (4) Model# DIYM436HPW01C99. MRCOOL. ... California Supply Chain Act; Site Map; Store Directory;. Coy gibbs cause of death
duCt Size 01-510-16 01-515-16 47 5/8 23 5/8 13 1/2 21 45 22 1/2 11 1/4 10 1/2 16 RD 01-510-18 ... • Units are fully insulated (both supply and return). ... SUppLy DUCT ThROUGh RETURn TRAnSITIOn (15 TOn AnD LARGER) DOUBLE DEFLECTIOn GRILLS BUILT In TURnInG vAnE. Typical specifications Furnish and install Ruskin Rooftop Systems "530 & 535 ...We spill the beans on how you can earn a ton of United MileagePlus miles — from credit cards to shopping portals, and more! We may be compensated when you click on product links, s...Sizing for 1500 sq ft 'could be'. 2 ton, 2 1/2 ton, 3 ton, 3 1/2 ton and even 4 ton. It's less likely to be a 4 ton, but that doesn't mean it can't be. That's the whole purpose of the heat load calculation. With that said, if you plug garbage into the heat load calc, that is what you'll get out of it. A heat load calc can be easily manipulated.Duct Size - Single Return As for any duct, size is dependent on duct length, air flow, and allowable static pressure drop. 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. Acoustical Flex Duct. The Unico return duct, UPC-04-xxxx, is an acoustical flex duct, 10 ft (3 ...approximately 400 CFM per ton of air conditioning moving through the air handler and duct system. Example: 3 tons x 400 CFM per ton = 1200 CFM total for a 3-ton unit. Each area of a building has a specific heat gain and heat loss that determines how much air will be required to heat or cool that area.8″, 10″ & 16″ all have the same price-point at $23 for a 50ft roll. These three sizes are great choices if you want to save money on your utility bills but still make sure that your mobile home has the perfect amount of airflow. The 14″ flux duck is more expensive than 8″, 10″ & 16″. It costs $33 for the same length which means ...NO. 2. 4-ton needs at least TWO 14" SUPPLY AIR Ducts of short length (IF they are FLEX). ... T W O 16" diameter flex would work IF properly installed. 1,600 CFM requires 2 Square Feet (~ 300 square inches) of flow area. FLEXIBLE DUCT LENGTH SHOULD BE LIMITED to 15 feet maximum on only the Branch runs.It’s why you should depend on Merts Heating & Air Conditioning which has been serving Illinois and Northwest Indiana since 1952. Learn more about the services we offer by liking us on Facebook and following us on Twitter. HVAC systems will have two plenum boxes, one on the supply side and one on the return air side serving as the …The hp that we were quoted for was a 3 ton unit (SUZ-KA36NAHZ) that requires between 762-1201 cfm depending on heating/cooling and dry/wet. ... however it's also much easier and more accurate to use yiur natural gas usuage and temperate to meause the size of hour unit. ... Worst case I'm thinking they can put supply duct up a closet to get up ...It made a huge difference, dropping the pressure in the bedroom (relative to the hallway) from about 6.7 Pascals (Pa) to about 1.7 Pa. The ENERGY STAR new homes program requires pressure balancing of bedrooms with a maximum pressure difference of 3.0 Pa.In most cases, if you are installing ducts in each room where there is a supply, you will want to go with the same size as your supply vents. If you are installing just one or two return vents, you will want to go with a 12-inch return for 2-ton units and lower. 14- inches for 3 and up. 16-inch should be suitable for 4 ton systems, whereas 5 ...Cholangiocarcinoma is a type of cancer that originates in the cells lining the bile ducts. Symptoms include jaundice and abdominal pain. Written by a GP. Try our Symptom Checker Go...Pull the airflow vertically to hit the friction loss line at 0.1 in.wg. Then, pull the line diagonally to the right and find the suitable duct diameter. 14″ round duct is less than ideal because the friction loss will be greater than 0.1 in.wg as the maximum airflow for 14″ round ducts is around 1027 cfm.Example 1: 1.5 ton AC covers how many square feet? Now you can answer this question. A 1.5-ton AC unit covers 900 square feet of living space.. Example 2: How many square feet does a 3-ton air conditioner cool? How many square feet does a 3-ton air conditioner cover is quite easy to answer as well. 3-ton is equal to 36,000 BTU.The furnace is way overpowered for the size of the house -- 130,000 btu whereas our needs are about 80,000 btu. An 80k btu furnace would give us a "3 ton blower," but because our current A/C unit is 4 tons, I'm told, this will be a mismatch. What is confusing me is the precise consequences of the mismatch..
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