Offers options methods, materials and construction for solving energy costs and conservation. Pdf smacna commercial duct design vuong le academia. Calculate the values of c s at the various attachment locations in the building 3. Smacna cad symbols dxf format air duct leakage hvac 2011 technical paper pdf file smacna published the hvac air duct leakage test manual in conjunction with the smacna hvac duct construction standards. Download hvac duct construction tables according to smacna and rule of thumbs pdf. Duct leakage measurements % of flow requirements problem. Smacna hvac duct construction standards 120 of 118 results.
Sealed nonmetal flexible duct is an average of class 12. Offers options methods, materials and construction for solving energy costs and. Table 1 in accas manual j lists design con ditions for locations in the u. Manual q gives you timesaving quick fitting loss tables and a complete set of fitting loss tables compiled from the ashrae and smacna handbooks. The length of duct used for design purposes that includes the. Primarily used for commercial and institutional projects, but applicable for residential and certain industrial work. How to use duct sizing with cfm and friction loss table 2017 how to use duration. Related commercial resources ashrae handbook fundamentals chapter.
Duct design quick introduction duct sizing tools and methods recommended duct velocities and noise effects. Duct sizing and construction tables according to smacna pdf. Rules of duct design acca manual d residential duct systems. Disclaimer of warranties a the sheet metal and air conditioning contractors national association smacna provides its product for informational. Compliance to the design manual, which promulgates minimum performance design standards for va owned and leased. Pdf smacna commercial duct design erick m c academia.
See smacna hvac duct systems design manual table 51 for longitudinal seam leakage rates. Duct construction, including sheet metal thicknesses, seam and joint construction, reinforcements, and hangers and supports, shall comply with smacnas hvac duct construction standards metal and flexible and performance requirements and design criteria indicated in duct schedule article. Smacnas industrial duct construction standards committee is indebted to dr. Download hvac duct construction tables according to smacna. Ordinary heating, ventilating, and air conditioning duct systems read air pressures at 0. Principle of duct design in hvac systems cedengineering. 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. Highvelocity hv duct systems are characterized by air velocities in the range of 2500 to 3500 fpm. This has included active participation in technical and standards committees for professional organizations that serve the hvac industry, such as ashrae, astm, amca, and smacna.
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. Repair leaks and repeat tests until total leakage is less than 1% of system design airflow when the system is pressurized to the design duct pressure class rating. This second edition of the smacna commercial metal and flexible duct. The types of fittings to be used based on the designers calculations of fitting losses i.
Hvac training what is smacna standards for ducting. Foreword this third edition of the smacna commercial metal and flexible duct construction standards is another in a long line dating from the 1950s. Air distribution basics and duct design office of energy efficiency. A quick overview of the changes is provided in the front of this manual. Free ductwork tables for sizing and construction of hvac air ducts. Ansismacna 0062006 hvac duct construction standards. Prescribes construction detail alternatives for uncoated and galvanized steel, aluminum and stainless steel ductwork consisting of various sections, transitions, elbows, fittings and accessories. The table below can be used to compare equivalent diameters for rectangular and round circular ducts, ductwork sizing, friction loss, sheet metal gauges, etc. This text has been extensively revised and updated, and now includes key portions of the previously separate duct design home course study material. Hvac duct construction standards metal and flexible copyrighte1996 all rights reserved by sheet metal and air conditioning.
Smacna smacna round duct smacna industrial duct construction standards accepted industry practice for industrial duct construction industrial network basics practical guides for the industrial technician duct sizing. Further considerations duct sizing methods there is no single duct sizing method that will inherently give the best duct design. Industrial duct is a broad classification of ductwork used in industry for many diverse applications. The third edition of the hvac duct construction standards metal and flexible is intended primarily for commercial and institutional duct construction. Calculate c s from the information in the applicable local building code 2. With rightcommduct, compute duct and fitting size based on air flow with appropriate velocity limits, and let the. This document is not a procedural stepbystep set of instructions on how to create a duct design. This manual provides the hvac system designer detailed information on duct design and u. The tables as shown herein are the smacna tables with those interpretations already substituted.
Lowvelocity ductwork design is very important for energy efficiency in air distribution systems. A comprehensive duct layout indicating sizes, design airflows, pressure class, and routing of the duct system. Rightcommduct is a fast, easytouse commercial duct sizing and calculation software that takes full advantage of ashraes precision measurements and duct fitting database. This standard is intended to provide useful information to the professional service.
Standard for ventilation control and fire protection of commercial cooking operations. Dec 5, 2018 download hvac duct construction tables according to smacna pdf free ductwork tables for sizing and construction of air ducts. Duct design clicking on a companys name will take you to their web site. More available in the ashrae handbook or smacna obtain other duct fittings pressure losses from manufacturers such as duct heaters, dampers, filters, grilles, coils, etc.
The fourth edition of hvac systems duct design presents the basic methods and procedures required to design hvac air distribution systems. The procedures of residential hvac design see figure 1 are covered in detail by a series of. Manual q commercial low pressure low velocity duct system. Research proved that duct leakage could be well defined as a function of the static pressure and the surface area of the duct. By conducting joint performance testing as described in section vii of the smacna hvac duct construction standards, 2nd ed. Smacnas mission is to provide products, services, and representation to enhance members businesses, markets, and profitability. If 0 ft2 duct area 3 cfm leakage 100 ft2 300 ft2 duct area cfm leakage 100 ft2 test pressure requirements problem. This 2017 va hvac design manual for the department of veterans affairs va healthcare facilities is the only detailed design requirements manual for va. Smacna cad standard second edition v notice to users of this publication 1. Modified equal friction, incorporating many of the benefits of. Revised design manual for commercial and light industrial hvac systems. Design duct for maximum negative pressure practical to accommodate improper operation or poor maintenance. Unsealed flexible duct leakage average is estimated to be class 30.
Lowvelocity design will lead to larger duct sizes, but it may be worth since, doubling of duct diameter. This information should be consulted to ensure that the proper type and location of duct system is selected for the structure in question. All comparisons of cost and performance in this example are based on a design pressure of 2. Indicate the required smacna shl tables to be used at the different attachment locations. This guideline is intended to help the commercial duct installation contractor, design engineers and building owners to become more familiar with guidelines to control and reduce contamination during duct installation, and to provide reasonable installation recommendations that can be implemented to meet these goals. Soteriades, of the catholic university of america, for his work in developing these standards. This manual provides the duct system designer with the technical information required to design a complete air distribution system. Fundamentals distribution systems 1 introduction this technical development program tdp covers the fundamental principles of duct sys tem design for commercial building applications. One of the main considerations in the development of the new standards is the opportunity to create a software program. Sheet metal and air conditioning contractors national association subject. The most popular duct sizing method equal friction is covered in detail.