The basic principles of duct design, part 1 energy vanguard. Ansismacna 0062006 hvac duct construction standards. Refer to the links on the left for more information. Duct system sizes and airflow quick chart created date. Rightsizing of an hvac system involves the selection of equipment and the design of the air distribution system to meet the accurate predicted heating and cooling loads of the house. Larger volumes or higher static pressures should be dealt with on an individual. Duct sizing and construction tables according to smacna pdf. To this point in our little series on duct design, weve been calculating intermediate quantitites. Free ductwork tables for sizing and construction of hvac air ducts. Air flow problems have plagued the hvac industry for years. Fellow ashrae 0 f the three duct design procedures recommended by the 1997 ashrae handbookfundamentals, only the tmethod incorporates lifecycle cost. Rightsizing the hvac system begins with an accurate. Hvac ducting principles and fundamentals 2012 instructor. Manual d hvac duct design and layout drawing service.
Larger volumes or higher static pressures should be. New ductsizing calculator available from ashrae and adi. Fibrous glass insulated hvac duct systems 3 sheet metal ducts lined with fibrous glass insulation fibrous glass duct liner insulation is designed for application to the interiors of commercial and residential sheet metal heating, ventilating, and airconditioning ducts to attenuate noise generated by central air handling. A comprehensive duct layout indicating sizes, design airflows, pressure class, and routing of the duct system. The manual d is a complete schematic drawing of the duct system including locations and sizes of trunklines, branch ducts, outlet registers, an inlet grilles getting a complete manual d hvac design done on your property plans is the best way to ensure that your heating and cooling system will deliver maximum comfort at high efficiency. Below is a simple model for determining duct sizes. Were following the manual d protocol for duct design, a standard developed by the air conditioning contractors of america acca. The ashraefundamentals handbook contains hvac design criteria for most countries around the world. A new ductsizing calculator from ashrae and the air distribution institute adi allows hvac airdistributionsystem designers to size ducts more accurately, especially flex ducts under varying amounts of compression, based on research results the duct size calculator is a quick reference tool for approximating duct size and equivalent sizes of sheetmetal duct and flexible duct. Duct design clicking on a companys name will take you to their web site. Consequently, the total pressure or total energy of air.
Another important factor in the installation process is to make sure the duct work is sized properly. The types of fittings to be used based on the designers calculations of fitting losses i. This equalfriction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Pdf hvac calculations and duct sizing suryaprakash. Ducts conforming to nfpa 90a or 90b shall meet the following requirements.
The following duct sizes are based on a fraction drop of. Because of the complexity of designing duct systems, we highly recommend using the acca manual d for sizing ductwork, or consulting a professional hvac contractor. Duct designer streamlines duct design and improves calculation precision, letting you optimize your designs. Residential main supply trunk ducts, nonzoned systems. Ductwork sizing, calculation and design for efficiency. The table below can be used to compare equivalent diameters for rectangular and round circular ducts, ductwork sizing, friction loss, sheet metal gauges, etc. The chart assumes the blower motor and total effective length of the duct system to be adequate for a. Insert ducts to your sketchup model with the engineering toolbox sketchup extension. Residential duct sizing guide the following duct sizes are based on a fraction drop of. The model applies to system up to 60 feet from unit to register. Ductsize lets you create a complete duct system from start to finish, and gives you control over every aspect of the design. Duct sizing, duct calculation, duct design, energy efficient ductwork design. Residential duct sizing guide key points to remember when using this guide the sizing chart is designed for estimating the airflow in an average system.
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. The fourth edition of hvac systems duct design presents the basic methods and procedures required to design hvac air distribution systems. Related commercial resources ashrae handbook fundamentals chapter. Handbook of heating, ventilation and air conditioning. Quick introduction a good duct design is a balance between. This manual provides the hvac system designer detailed information on duct design and u. Figure 3 is a sketch of an air conditioning cycle plotted on a psychrometric chart. New duct sizing chart purchase your hvac equipment. Hvac essentials series air distribution course ss105 version 2 2012 hvac learning solutions page 6 of 44 1.
Dont kill your air flow with this flex duct disease. Fibrous glass insulated hvac duct systems 4 sheet metal ducts with exterior fibrous glass exterior insulation flexible blanket fibrous glass duct wrap insulation is designed for application to the exteriors of commercial and residential sheet metal heating, ventilating, and airconditioning ducts and plenums operating at temperatures between 40. Today we use all that to find out how big the ducts need to be. A preliminary duct layout can be compiled as in figure 2 with each duct numbered, and showing the volumes required in each room. Duct design quick introduction duct sizing tools and methods recommended duct velocities and noise effects. Over sizing systems cost more and does not maintain the desired air flow and undersized duct work causes the system to strain mechanically and can be noisy. Duct system design guide first edition 2003 mcgill airflow corporation mcgill airflow corporation one mission park groveport, ohio 43125 duct system design. Duct calculator is a powerful tool that provides access to duct calculation and sizing capabilities either. 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. Philadelphia, pa piedmont, sc indianapolis, in southaven, ms fremont, ne caldwell, id. Rightsizing of a heating, ventilation, and airconditioning hvac system is the selection of. Download hvac duct construction tables according to smacna and rule of thumbs pdf. Heat conduction and thermal resistance for steady state conditions and one dimensional heat transfer, the heat q conducted through a plane wall is given by.
Equipment sizing load blower cfm equipment sizing load btuhour 1. This will provide the knowledge necessary to recognize possible design errors and understand the effects of various design decisions. The course concludes with the basic instructions for filling out a manual d speedsheet. Duct design quick introduction duct sizing tools and methods recommended duct velocities and noise effects duct fitting pressure losses do and donts of duct design duct applications as 4254. A proper hvac duct sizing will guarantee that your.
In addition to the basic engineering guidelines for the sizing of hvac ductwork systems, the. Principle of duct design in hvac systems cedengineering. Increased friction rate in compressed flexible duct. Studies show that hvac air duct systems are one of the major electrical energy consumers in industrial and com. This 3hour hvac training online video series provides guidance on how to properly use a friction chart andor accas duct slide rule values for sizing duct in the field.
Design of flexibleduct junction boxes current standards ashrae 2012 hvac systems and equipment, box plenum systems using flexible duct constrains box width to 23x entrance width constrains box length to 2 x box width flat pressure loss 0. Small ducts 66 design velocity 66 maximum velocity 67 sizing high pressure ducts 68 return air ducts hvac. Total pressure total pressure measures the total energy of the air in a duct fig 3 similar to the way watts measures the. Home software download mcquay duct sizer for hvac duct sizing download mcquay duct sizer for hvac duct sizing 10302016 01.
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