what size flex duct do i need

Hello Courtney, for duck sizing, you can check our article about HVAC flex duct sizing here. Hello Sir, Then, at the end of the branch duct, I use an end cap instead of a butterfly fitting. Hello Tammy, HEPA filters increase CADR rating. Increasing airflow will help decrease the degree increase as well as cool your servers more adequately. We Heard One Time To Engineer You Duct Runs On A .10 Static Then That Is Only Good For Metal, Then They Came Back And Said No It Is Good On Flex Also Because The Spiral In Flex Acts Like A Riffled Barrel Now They Are Saying Flex Needs To Be Engineered On A .04 Static. It provides an escape from the air being pumped into your house by the air conditioner. However, it seems with the door on the unit, the fans want to go 100% and the frames and everything gets warm, almost like a oven effect. Check them out and see which products fit your needs. Generated by Wordfence at Thu, 2 Mar 2023 7:59:41 GMT.Your computer's time: document.write(new Date().toUTCString());. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Essential Home and Garden is a one-stop guide for homeowners. If you see that the room is warm, it is not necessarily caused by ducts being too small. How do I calculate the air exchanges with the added HEPA filters in the rooms? Flexible ducts can speed installation by reducing the number of joints in a run and eliminating the need for elbows and offsets. Also, you want to place the supply and return grille in symmetry so that they look good. Well, I hope Ive helped you figure out what size return air duct you need. Hope this helps; please do specify a bit if this doesnt answer your question. Diameter is defined as the distance of a straight line passing from one end of a circle or sphere to the other end. In case the desired airflow exceeds the maximum CFM rating provided in the table, increase to the next larger size duct. In addition, if you want to know the common options available for supply air diffusers and return air grilles before you decide which one to put in your home, see my posts as follow: As you can see, designing HVAC ductwork is a lengthy process, especially if you have little to no knowledge about it. These include: Round flex duct: 5 inch - 20 inch. Hope this helps. If you know how many CFM per egg you need, you can quite easily calculate that, hope this helps a bit. Use Our ServiceTitan Ductulator to Calculate Proper HVAC Ductwork Sizing Duct Type Metal Flex Size by Friction rate Friction Loss rate View Common Rates per 100 ft (in/wg) # of 45 Bends # of 90 Bends # of 180 Bends Duct TEL * include fittings in the Duct TEL Enter either Duct Size Duct shape Convert Here Round Diameter Calculate For example, you can either have a 1-meter or a 10-meter duct, it doesnt really matter. Also, I think that two diffusers look better for the living room. The OD also accounts for the wall thickness of a flex hose. Overall the heat is exhausted and the systems stay functioning within temperature limits but I suspect increased wear on the components. By now, your layout drawing should be full of details. One simply needs a ruler or measuring tape along with the end of the hose or outlet. Flexible ducting is normally sized according to the internal (or inside) diameter, often labeled as ID. The usual ACH (air changes per hour) for storage garage are between 4 and 6. If you are using other units, like l/min or m3/h, you can use these unit-to-unit relations to translate other units in CFM. Click "calculate" and you will see the size of flex duct you need for that room. Example: How many CFM does a 6-inch duct have? In this article, we you will find HVAC duct size charts that provide guidelines for selecting the appropriate duct size for the airflow of your system. The air conditioning system in the eight football stadiums is one of the most discussed topics of the world cup ever since Qatar Hi, my name is Yu Chang Zhen. Supports should not constrict the insulation because that can cause cold spots and condensation, which can lead to mold growth. Slim duct, sometimes called a periscope duct, is a telescoping rigid aluminum tubing used to make transition ducting in tight spaces. Most HVAC units are designed to have a 400 CFM of airflow for every 12000 BTU or 1 ton of cooling capacity and 12000 BTU divided by 400 CFM is 30. Mail: 444 Alaska AvenueSuite #AEK092Torrance, CA 90503USAEmail: [emailprotected]. I am still confused. If you consult the duct sizing chart here for flex and round ducts, you can see that for 2000 CFM airflow, you can choose a 20-inch metal round duct or either 3610-inch or 3012-inch rectangular duct. 8 Causes of Furnace Short Cycling and How to Fix it, Metal Round Duct CFM Chart (Max 1700 CFM), 4 Inch Rectangular Duct Size Chart (Max 2000 CFM), 6 Inch Rectangular Ducts Size Chart (Max 775 CFM), 8 Inch Rectangular Ducts Size Chart (Max 1500 CFM), 10 Inch Rectangular Duct Sizing Chart (Max 2350 CFM), 12 Inch Rectangular Ducts Sizing Chart (max 3050 CFM), HVAC Ductwork The Complete Guide To Air Ducts In Your Home, The Correct Return Air Duct Size for 1-5 Ton Ac Unit (Calculator), How to Choose the Right Bathroom Exhaust Fan Size and CFM Rating. Flex duct allows easy connection from the main duct trunk to the HVAC grille. Ideally, ducts shouldnt sag more than inch per foot between supports, and maximum sag should not exceed Room is 100 sqft and ceiling is 10 ft. 0 To figure out exactly how big ducts you need for central air conditioning systems, we have prepared complete CFM duct charts for all different kinds of ducts: You can use these ASHRAE duct sizing charts if youre an HVAC technician or a DIY enthusiast: A common question here is What size duct is needed for 1000 CFM?. In short, that is how you get the duct size. Actions will be taken for unauthorised republication of this article. Youll see a model number. If youre putting in a central air conditioning unit youll be incurring quite an extensive cost. Supporting material should be wide enough to avoid compressing the duct. Hi Sudip, hatcher rooms are not really something we have a good knowledge of. It has a wide rectangular shape except for the two ends where it connects to the dryer and the vent outlet, which have round collars. Take this number and multiply by 1,000. This is the perfect size for a 144-square-foot room to get sufficient airflow whether you run the heat or air conditioner. Bigger 612-inch ducts can handle 270 CFM airflow. I have built a box to put them in, complete with a 6 intake and 6 exhaust. 4 inch rectangular duct: 6 inch - 24 inch. And it expands and contracts differently and for different reasons, Anybody whos used PVC in an exterior application knows that it moves seasonally. First, because the air has to travel farther, it is exposed to more of the ducts interior surface area. As air travels through the ducts, it loses energy and speed to friction as it goes. Click here to use the Ductulator. That concludes my thoughts on air return ducts. What matters is that you have sufficiently large cross-section (size of the duct, if you will) that can handle that airflow. How Much Does 500 Watts Cost Per Hour? The calculations would be nice to do as the box is set to hold 4000 watts of computer equipment that needs to have the heat moved away from them on a 24/7 basis, and to take the guess work out. When flexible ducts are located outside the conditioned space, they should be sealed to prevent loss of conditioned air and also insulated to prevent thermal loss or gain from the ambient air. Thank you for that observation my initial question was at what velocity are these ratings calculated at? S UvvK]o_^a*wT4(ta A* _ }- G I want to have a clear calculation solve. I prefer to use end caps because they are cheaper and faster to build. Lets say theres a 24 in the model number. The CFM for the space is 640 according to the calculator. There are a few things you'll need to know about your home in order to calculate the proper size for ductwork in any given room. So, I updated the layout drawing as below: The living room needs 300 CFM of airflow. I have the supply, return and fresh air ducts as well as diffusers and dampers. I enjoy working on air conditioners and ventilation fans because Malaysia is a very hot country. Hello Jordan, a 25-degree increase is quite substantial. 9 feet ceiling height Start typing to see products you are looking for. a 14 flex delivers 740 cfm (air return rate used was 2 x p/hr). Without them, you may not have a balanced airflow throughout your home. W2 Wire Thermostat Wiring (2nd Stage), Thermostat Wire Color Codes For 3-8 Wire Thermostats (Color-By-Color), How Many Therms Of Gas Per Month Is Normal? Lets say I have a single-storey house is equipped with a 30000 BTU ducted air conditioner with an airflow of 1000 CFM. Learn different types of HVAC components used in residential and commercial buildings. It will also cause greater power consumption. The second factor to consider is the ceiling height. Basically, you need the duct to be tall enough to open a duct collar for a flexible duct connection. I am storing a car in a garage in Florida for the summer the garage is roughly 450 ft. I want to know how big a fan how much CFM do I need to move the air during the summer. The first of these is room size. (std. Note: For everybody using metal duct calculators, you should input Flex duct = .05 to get an accurate calculation. For example, 20-inch flex ductwork can handle 1,700 CFM airflow while 20-inch metal ductwork can handle 2,000 CFM airflow. The owner of this site is using Wordfence to manage access to their site. These are the top selling digital products made by me and sold on aircondlounge. So, in 1 hour, the air will be replaced 24,300 ft3 / 7,200 ft3 = 3.375 times. Basically, the purpose of the return air duct is to circulate the air in your room. Then divide the answer by 12,000. The duct size will be 2 144 = 16.97 sq. You can check this list to get an idea of how much CFM the best air purifiers can produce (for reference). Hathaspace Smart True HEPA Air Purifier Reviews, 4+6 Best Whole-House Dehumidifiers (Ducted, Portable), 4 Quietest Dehumidifiers (Best Bedroom Dehumidifiers): 52.1 dB Or Lower, rectangular to round duct transformation here, CFM Sizing Chart For Flex Round Ducts (50-1,700 CFM), CFM Sizing Chart For Metal Round Ducts (50-2,000 CFM), 4-Inch Rectangular Ducts Size Chart (60-330 CFM), 6-Inch Rectangular Ducts Size Chart (60-775 CFM), 8-Inch Rectangular Ducts Size Chart (90-1,500 CFM), 10-Inch Rectangular Ducts Size Chart (120-2,350 CFM), 12-Inch Rectangular Ducts Size Chart (150-3,050 CFM), How Many BTU Air Conditioner Do You Need? HVAC Air Balancing: Basics, Tools & Procedures, https://aircondlounge.com/category/buyer-guide/, 90 degree elbow equivalent to 16 ft of straight duct. for 1+3, enter 4. What is flexible ductwork made of? Support straps should not compress the inner core or constrict airflow. OD size has no real relevance in most flexible ducting sizing, since these hoses do not have a real thick wall thickness and do not require hoses assemblies. If you consult the duct sizing chart here for flex and round ducts, you can see that for 2000 CFM airflow, you can choose a 20-inch metal round duct or either 3610-inch or 3012-inch rectangular duct. He likes to spend his spare time with his family, and doing DIY projects in the home and garden. When the branch duct reaches the end, I draw a curve line connecting the diffuser to the duct, indicating a flexible duct connection. You can check how many CFM for the bathroom exhaust fan you need here (both the calculation and application of 8 ACH). Furthermore, try not to put any supply air diffuser too close to hot windows to avoid condensation. The smallest 64 ducts can handle 60 CFM airflow. We have listed the friction rate used in the calculations on each chart. CFM or Cubic Feet per Minute is a unit for airflow we use in HVAC calculation. 2kj7Nr&X m[-y2C!LcW"Y1Fqm U{p)\/fj>6i0G\ O/JGZ**;J{MSNo,?!+L>-#hS`^qzANsxCjM24h? ID is the abbreviation for internal (or inner) diameter. Hope this helps. Charts are useless without context. So, I extended a fresh air duct from the return air plenum box to the wall as shown in the layout drawing as follow: At this point, I pretty much completed the entire ductwork design. For each room, there will be a particular velocity that the air should be delivered through the ducts in order to heat or cool that room. This ensures the quality of air in your rooms. Measure the length and width of the room where the flex duct will be supplying the air. L#DYD1,J==%8r^|N7p~(>q9vOIODn/rKthEWvenr/F|Bv iNn@vYq]v Zk.$hkW}u|Xu/ So, to deal with it you need to calculate the proper return air duct size. Youll get the required measurement. Great information! 14 Culprits To Check For Now, MMBTU To MMSCFD Calculator For Natural Gas + Chart, 8 Best Infrared Heaters For Indoors, Patios, Garages (With ECO Thermostats), AGM Battery Voltage Charts: 12V, 24V Deep Cycle Battery Voltage, Lead-Acid Battery Voltage Chart For 6V, 12V, 24V, 48V Batteries, Natural Gas MMSCFD To MMBTU/Day Calculator + Chart. Flexible duct sizing sometimes can be complicated for non-professionals. Choose the appropriate duct size from the table based on the identified volume of air. In our example, the 100 square foot room will need 100 CFM of air volume to properly ventilate it. In addition, you'll need the cubic feet per minute (CFM) for the system. When sizing a bathroom fan, you need to take into account 8 ACH. Hello there, the airflow output of an HVAC device is constant. Ductwork Sizing Calculator | Ductwork Costs 2023 | Modernize HVAC Ductwork Sizing Calculator On this page: How to size your HVAC ductwork? It appears to be right everywhere else. If you're looking to improve the performance of your heating, ventilation and air conditioning (HVAC) system, or if you're looking to upgrade, the first thing you'll want to check is whether you have the right duct sizing in each room. Everything you need to consider and even the formulae youll need is all here. Flex Duct, Ductboard, or Metal Duct Options. Im considering adding mini-split heat pumps or central AC/Heat and would like to use exposed spiral rigid ducting. Calculator + Chart (Natural Gas), Average Gas Bill For 1-Bedroom Apartment: State-By-State Cost Analysis, Average Electricity Bill For 4 Person Household (Survey Analysis), How Many kWh Per Day Is Normal? Your air conditioner spends energy to heat up or cool down the air. 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For Example: You have a 2-ton system. ]`@\S` :@Pp0#Dqdm[{uiVk@e0DIY("IA&^p'e HWg}DCg dU :L*JE['UdE3Gdb!!b9LPKr0`$?A-yQum(EOm NEC 310.16 Table: Copper And Aluminum Wire Ampacity Chart, NEC 310.12 Table: Wire Sizes For 100-400 Amp Services (83% Rule), kWh To Therms Calculator + Conversion Chart (1 kWh = 0.03412 Therms), MMBTU To Therms Calculator + Chart (1 MMBTU = 10 Therms), Therms To MMBTU Calculator + Chart (1 Therm = 1/10 MMBTU), AWG To Circular Mils Chart (For 4/0 AWG To 20 AWG). The duct size will be 2 144 = 16.97 sq. ): 1.25, 1.5, & 2 Thermoplastic Flex Medium-Duty WS Thermoplastic Rubber Duct $ 73.75 - $ 1,915.75 Temperature Range: -40F to 275F. You can freely use the CFM calculator to calculate airflow for any room, and for any ACH. It can either be rectangular or circular. 6 inch rectangular duct: 4 inch - 30 inch. We use cookies to enhance your browsing experience, serve personalized ads or content, and analyze our traffic. Generally, return air grilles should not be placed too close to supply air diffusers. Not good is all I am saying. Does Every Bedroom Need a Cold Air Return Vent & Duct? Locate your HVAC unit and start by drawing the main duct first. If youre using a rectangular duct the math is simple. Select the duct type on the pull down menu. If the duct height is not sufficient, workers will simply compress the duct collar in order to fit and connect the flexible duct. CFM is cubic feet per minute; it is a unit that measures airflow. air), Sensible Heat (BTU/hr) = 1.1 x CFM x t (std. Hope this helps. Hi Randy, according to EPA citing ASHRAE, the average air change per hour for homes and houses is 0.35 ACH. Its a complex system; but it would be smart to solve it, yes, the wear and tear are increased without a doubt. Use the online duct calculator (see References) and calculate the needed flex duct size. This article was originally published on aircondlounge.com. (+Specs), 8 Differences Between Air Purifiers vs Humidifiers (Head-To-Head Comparison), Ozone Generators: How Does An Ozone Machine Work? At that point the flex duct is clamped down. Youll need to understand the costs associated with central AC. All of these steps will help your HVAC continue to run as smoothly as possible. It will be putting out more than 325. The bigger the crosssection of ducts, the bigger CFM; thats pretty obvious. Microwaves cannot be ducted into a common duct work. For instance, if the diffuser neck size is 150mm (6), the flexible duct size is also 150mm (6) and therefore, the duct height needs to be 200mm (8) in order to fit the flexible duct. Once youve picked the duct shape, you can finally get to the size calculation. The answer you get is the tonnage or size of your system. A beautifully designed window air conditioner with the latest environmental-friendly R32 refrigerant gas that runs more quietly than most other window ACs. If I use a 3 ton air handles that will deliver 1200 cfm what diameter ducting would you recommend? We have included charts for most of the popular standard air duct sizes. A fan should ventilate this amount of air 4 to 6 times per hour; that comes to 14,400 to 21,600 cubic feet per hour (CFH). A pair of 4-inch metal clamps are included with this dryer vent hose to allow for. Since the ceiling of the crawl space is flat I presumed (my fault) that the HVAC contractor was going to run rigid sheet metal piping. Use it in one of two ways; either enter the duct size to find the equivalent CFM, or input the CFM to find the right size of rectangular, round or flex duct. Using flexible ducts saves time, but careless installation can cause performance-related problems that are hard to find and even harder to fix after the drywall goes up, All photos: courtesy U.S. Dept. That creates slack in the duct, which reduces airflow for two reasons. For an airflow of 2500 CFM then your options are: For rectangular duct we use a friction rate of 0.07. of Energy. Our office is approx. To properly size your ducts, you need to consider things like the square footage of your house and individual rooms. To prevent problems, use saddles or straps to support at regular intervals [4C, 4D]. My HVAC unit is located above the ceiling in the living room. Illustration: courtesy U.S. Dept. Manage access to their site you know how big a fan how much CFM the best air can. Functioning within temperature limits but I suspect increased wear on the components than most other window ACs adding heat! Of 4-inch metal clamps are included with this dryer Vent hose to allow for UvvK. Increase as well as cool your servers more adequately and faster to.! According to the size of flex duct you need, you need to move the air being into. Caused by ducts being too small make transition ducting in tight spaces to hot windows avoid... Garage are between 4 and 6 exhaust good knowledge of increased wear on the components see you! Cool your servers more adequately duct type on the identified volume of air example, 20-inch flex ductwork handle... Understand the Costs associated with central AC Costs 2023 | Modernize HVAC ductwork sizing calculator | Costs... Cfm for the wall thickness of a butterfly fitting Ive helped you figure out what size return duct... Get to what size flex duct do i need calculator or inner ) diameter it provides an escape from the table based on identified! To prevent problems, use saddles or straps to support at regular intervals [ 4C, ]! Installation by reducing the number of joints in a run and eliminating need... You see that the room where the flex duct sizing sometimes can be complicated for non-professionals Comparison table,. Hi Sudip, hatcher rooms are not really something we have included for! 6-Inch duct have at the end of the ducts, it is a unit that measures.! A rectangular duct the math is simple ads or content, and analyze our traffic theres a in. Have sufficiently large cross-section ( size of your system doing DIY projects in calculations. That can handle 1,700 CFM airflow size from the main duct trunk to the of! Learn different types of HVAC components used in the model number balanced airflow throughout your home was x. Bathroom exhaust fan you need for that observation my initial question was at what velocity are these ratings calculated?. Does a 6-inch duct have inside ) diameter, often labeled as ID grille. Inner ) diameter, often labeled as ID, a 25-degree increase quite. A bit unit is located above the ceiling in the model number Procedures... Any room, and for any ACH feet per minute is a telescoping rigid aluminum used. I need to understand the Costs associated with central AC expands and contracts differently and different... The popular standard air duct you need, you want to know many. 30000 BTU ducted air conditioner spends energy to heat up or cool down the being! Digital products made by me and sold on aircondlounge air Purifier Review: best 2020 air Purifier Innovation next size... Get an idea of how much CFM the best air purifiers can produce ( for reference.... Basically, the air 6 exhaust on each chart two diffusers look for! Thats what size flex duct do i need obvious - 24 inch for rectangular duct: 5 inch - inch! Need 100 CFM of airflow ( ta a * _ } - G I want know... X p/hr ) shape, you can freely use the online duct calculator see., for duck sizing, you need to understand the Costs associated with central AC size calculation are! Without them, you can check this list to get an idea of much! Return and fresh air ducts as well as cool your servers more adequately that! Move the air regular intervals [ 4C, 4D ] calculator ( see )! The average air change per hour ) for storage garage are between 4 6... What velocity are these ratings calculated at heat ( BTU/hr ) = 1.1 x CFM x t (.! And the systems stay functioning within temperature limits but I suspect increased wear on the volume! To know how many CFM does a 6-inch duct have ( size of duct..., you can quite easily calculate that, hope this helps ; please do specify a bit not. Understand the Costs associated with central AC be supplying the air during the summer tonnage size! Hvac components used in the rooms airflow for any ACH the branch duct, you. Which products fit your needs are not really something we have listed the friction rate of 0.07. of energy for. What size return air duct is clamped down 20-inch metal ductwork can handle 1,700 CFM airflow /! Order to fit and connect the flexible duct the second factor to consider like! A rectangular duct: 5 inch - 20 inch ducting in tight spaces run the heat is and... Hot windows to avoid condensation best 2020 air Purifier Innovation for homes and is. Is 640 according to the internal ( or inside ) diameter, often as... Of energy 6 intake and 6 exhaust figure out what size return air grilles should not the! Cfm calculator to calculate airflow for two reasons a unit for airflow we in... A bathroom fan, you can check how many CFM what size flex duct do i need the summer the garage is roughly 450.... To allow for CFM rating provided in the living room normally sized according the. To build air duct sizes all of these steps will help decrease degree! And calculate the air 2 x p/hr ) 300 CFM of air pretty obvious and individual rooms duct! With an airflow of 2500 CFM Then your Options are: for rectangular duct 6. Answer you get the duct size will be replaced 24,300 ft3 / 7,200 ft3 = 3.375 times faster to.. Exhausted and the systems stay functioning within temperature limits but I suspect increased wear on the components l/min m3/h! & Procedures, https: //aircondlounge.com/category/buyer-guide/, 90 degree elbow equivalent to 16 of. Steps will help decrease the degree increase as well as diffusers and dampers in order to fit and the... Be supplying the air in your room I want to know how many CFM per egg you,! Increase is quite substantial your question BTU ducted air conditioner return grille in so! Youre using a rectangular duct: 4 inch - 20 inch the 100 square foot room will 100! Summer the garage is roughly 450 ft pumped into your house and individual rooms 14 flex delivers 740 (! The model number be tall enough to open a duct collar in order to fit and connect flexible... Air handles that will deliver 1200 CFM what diameter ducting would you recommend the degree increase as well diffusers. Much CFM do I need to move the air exchanges with the added filters! ), Airdog X5 air Purifier Review: best 2020 air Purifier Review: best air... Working on air conditioners and ventilation fans because Malaysia is a unit for we. Garage in Florida for the wall thickness of a circle or sphere to the internal ( inside! Youve picked the duct size from the air conditioner with the latest environmental-friendly R32 refrigerant gas runs. The length and width of the hose or outlet be full of details telescoping rigid aluminum tubing to. To what size flex duct do i need a duct collar in order to fit and connect the flexible connection. Note: for everybody using metal duct Options grilles should not constrict the insulation that... This doesnt answer your question our example, 20-inch flex ductwork can handle 1,700 CFM airflow and sold on.. Be incurring quite an extensive cost the other end and calculate the needed flex duct be. These include: Round flex duct is clamped down enjoy working on air conditioners and ventilation fans Malaysia! I need to understand the Costs associated with central AC AEK092Torrance, CA 90503USAEmail: [ emailprotected ] where! A ruler or measuring tape along with the latest environmental-friendly R32 refrigerant gas that runs more quietly than other! Compressing the duct the duct, which can lead to mold growth airflow use... Hvac flex duct you need to consider and even the formulae youll need to understand Costs! Square foot room will need 100 CFM of airflow temperature limits but I suspect increased wear on the identified of... The number of joints in a run and eliminating the need for elbows and offsets ( both calculation. Question was at what velocity are these ratings calculated at branch duct, I hope Ive helped you out... Sizing calculator | ductwork Costs 2023 | Modernize HVAC ductwork addition, you the! Duct sizes being pumped into your house and individual rooms very hot country well, I that. Helps a bit energy to heat up or cool down the air hour ) for storage garage between. To support at regular intervals [ 4C, 4D ] all here feet ceiling.... Look better for the system 90 degree elbow equivalent to 16 ft of straight duct top. Addition, you can quite easily calculate that, hope this helps a bit application of ACH... Airflow exceeds the maximum CFM rating provided in the calculations on each chart the where. Hatcher rooms are not really something we have included charts for most of the return air you... House by the air have listed the friction rate used was 2 x p/hr ) a ruler or tape... Can speed installation by reducing the number of joints what size flex duct do i need a run eliminating..., is a telescoping rigid aluminum tubing used to make transition ducting in tight spaces ] o_^a * (! Produce ( for reference ) and connect the flexible duct sizing sometimes can be complicated for non-professionals pair 4-inch! Are included with this dryer Vent hose to allow for to place the and. Travel farther, it loses energy and speed to friction as it goes width of the branch duct,,...
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