Duct system design guide first edition 2003 mcgill airflow corporation mcgill airflow corporation one mission park groveport, ohio 43125 duct system design i notice. Although many of the parts and fittings used in sheetmetal work are. What is the most efficient pathway for routing the duct. Ease of handling and quick installation make reflectix the first choice when selecting insulation for round or rectangular ductwork in hvac systems. Lj assemble, join, install, and repair all types of duct.
In this example, the plan has a rough ceiling height of 4 12 to allow for the ductwork, the ducts have been set at a height of 117. Duct design quick introduction duct sizing tools and methods recommended duct velocities and noise effects. Sheet metal duct layout book free download as pdf file. Connect different components such as couplings and stop the flows such as caps. Design of flexible duct junction boxes acca manual d, group 11 fittings recommendations. Types of pipe fittings used in piping a complete guide. Jul 03, 2018 duct sizing, duct calculation, duct design, energy efficient ductwork design.
With rigid duct, you turn the air with fittings, but unfortunately thats not always the case with flex duct. Ductwork proudly sponsored by this information first appeared as the article basics of duct design by. Students or novice designers should read and study this material thoroughly before proceeding with the design sections. Attach the second end of the pipe to the fitting register boot in the supply outlet location. This is the only layout book to teach basic principles that apply to all layout problems, timesaving shop methods of layout for the. Lowe s and the gable mansard design are registered. This book teaches you everything you need to know to make it easy to solve any layout problem, from the most basic to the most complex. Duct systems are designed to properly distribute air throughout a building.
Obtain other duct fittings pressure losses from manufacturers such as duct heaters, dampers, filters, grilles, coils, etc calculated by the following formula derived from bernoullis. Ductwork sizing, calculation and design for efficiency the. Velocity classification vs pressure classification generally speaking, a. Duct board fabrication instructions for heating and cooling air duct systems operating at velocities up to 5000 fpm, 250f, 2 w. This course will discuss the basic fundamentals and principles of air conditioning duct design. Fittings are manufactured on our state of the art fabrication equipment. Ensigns pdf take off software designed to simplify the takeoff process. Sheet metal air ducts and fittings with rectangular crosssection. All galvanized and pcs spiral duct 6 and larger is corrugated unless ordered without corrugations. Layout for duct fittings indoor environment technicians library leo a.
The third edition of the manual was approved in june 1988 and published in 1989. Full worked example included with cfd simulations to optimise your design to ensure the highest energy efficiency. The layout includes fittings from the local loss coefficient tables, with emphasis on converging. Catalog 4300 pdf section updated october 2017 visual index pipe fittings and port adapters this section contains adapters with thread types including. The purpose of residential ductwork design is to properly distribute the airflow, produced by your heatingcooling system, to your house.
Refer to uangyihtech flanges system section for adapters, drains and test port aw end available. All fittings can be provided as continuously welded if required. These tips will make you more valuable on the job because you will have the confidence to tackle and solve any layout problem without the help of a computer. Layout for duct fittings downloadable by leo a meyer 112 pages, 6 x 9 wiro softcover. Combination metal duct, panned joist space filename. Chapter layout and fabrication of sheet metal and fiberglass duct topics. Layout for duct fittings free download click here to get file. Add 20 more of pipe and so on you increase resistance as you add more pipe and fittings. Design2fab shape library and variations page 1 of 4 create thousands of custom fittings parts from these basic templates. No part of this work may be reproduced or used in any form or by any means graphic, electronic, or mechanical, including photocopying. May 25, 2017 the basic principles of duct design, part 1.
The second edition of this manual was approved in june 1984 and published in 1985 with the title steel pipe a guide for design and installation. Complex custom fitting layouts may now be created in minutes not hours. Smc tdc, slipdrive and raw sheet metal connectors, inc. 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.
Below is a simple model for determining duct sizes. Chapter layout and fabrication of sheet metal and. As a seabee, you will use many prefabricated ducts and fittings. All fittings are fabricated with stiffening beads on duct sizes 19 wide and larger which have more than 10 square feet of unbraced panel. Primary air ductwork fan connections, risers, main distribution ducts shall be medium pressure classification. Duct design fundamentals static pressure ps measure of the static energy of air flowing air which fills a balloon is a good example of static pressure equally exerted in all directions the atmospheric pressure of air is a static pressure 14. Ducts that are not well designed result in discomfort, high energy costs, bad air quality, and increased noise levels. Whether the application is hvac duct, mechanical, kitchen, industrial, roofing or specialty, design2fab is known for its superb versatility.
Duct and conduit 473 chapter 14 duct and conduit introduction the general purpose of conduit, or duct, is to provide a clear, protected pathway for a cable, or for smaller conduits, sometimes called innerducts. Smc manufactures coil line ductwork in 456 lengths. Explain operation of the supply and return air duct systems. You can draw horizontal and vertical ducts using the duct commands on the systems tab hvac panel, or by using the duct options from the context menu when rightclicking the connector on duct ends, duct fittings, air terminals, mechanical equipment, and duct accessories. Pipe fittings and port adapters dimensions and pressures for reference only, subject to change.
Easytounderstand, stepbystep instructions from an experienced layout man. Explain why and how to use mastic and fiberglass membrane. P total the total pressure loss across the duct fitting k t the pressure loss coefficient of duct. Ceiling plenums, duct chases, and obstructions such as walls and beams often dictate that a certain size duct be used, regardless of whether or not it is the best size from a. Often the equivalent length of a fitting can be equal to or longer than the straight duct lengths due to the additional. This information should be consulted to ensure that the proper type and location of duct system is selected for the structure in question. Hvac duct drawings hvac estimating shop drawings duct design zen mep is a service of zen industries inc. How much ductwork will be needed to complete the installation. The noise level in a duct system does not progressively decrease away from the fan until it reaches zero. Principle of duct design in hvac systems cedengineering. A fixed volume flow rate cfm through a fixed system layout and sizes results in a fixed total. Layout manual for sheet metal duct fitting for the hvac sheet metal industry. Layout for duct fittings indoor environment technician s library leo a. Hvac duct layout manul sheet metal hvac duct fittings.
Master any situation with principles and shortcuts few techs know for laying out the patterns for all the common rectangular and round duct fittings and transitions. Fittings such as tees, elbows, offsets, and transitions may. Reflectix submittal sheet reflectix duct insulation is an alternative to other types of fibrous insulation products. Boards aregroovedat fold lines with either shiplap or vgroove tools. Entrance has a diffuse fitting that recovers velocity pressures and prevents swirl optional straight approach and straight exit exit opening on side no top or bottom exits exit opening at least two diameters from entrance l. Duct revit products 2019 autodesk knowledge network. Ductile iron flanged fittings when a ductile iron flanged fittings is wanted with a tapped connection, give the size of the tapping required, and designate its location by means of a letter selected from the correct view of the fittings in question. Understanding basic residential ductwork design please note. Upstream velocity of fitting h height of the duct w width of the duct r radius of the bend. This is alnors range of rectangular ducts and fittings for ventilation systems.
Table 1 in accas manual j lists design con ditions for locations in the u. The amount of duct length added to a duct run by fittings. Obtain other duct fittings pressure losses from manufacturers such as duct heaters, dampers, filters, grilles, coils, etc. Layout for duct fittings indoor environment technicians.
Attach filter bags and 10 of pipe to the inlet and you have added resistance. Alnor also fabricates custom fittings to individual design requirements. Effective length the length of duct used for design purposes that includes the straight length of duct added to all the fitting equivalent lengths. Basic guidelines for ductwork fittings and placement please note. Jun 20, 2016 revit mep 2017 hvac duct fittinges takeoff phone. Advances in cable technologies, as well as the expense of. Get easytounderstand, stepbystep instructions from an experienced layout man in layout for duct fittings. Although many of the parts and fittings used in sheetmetal work are stock items, which are simply. Various fittings such as elbows and angles may be required to efficiently run to the supply outlet. When air comes out of the air handler, several things happen to it. On the paid page you can learn how to make this kind of fitting by using only handtools.
Chemical and tasteandodor evaluations of pvc compounds for potable water. Basic guidelines for ductwork fittings and placement. Numerous types of layout tools, cutting tools, and forming equipment are used when working with sheet metal. Fittings are spot welded andor gorelocked through 40 diameter. Round duct systems can significantly reduce the cost of labor for fabrication and installation, and produce very satisfactory results if properly applied. If you turn on a dust collector with out anything attached to it pipe, flex or filter bags, it will pull max volume at free air without any resistance. There is a lower limit caused by selfgenerated noise. Layout for duct fittings indoor environment technicians library. Fundamentals distribution systems 2 space availability the sizing criteria will often be defined by the space available to run the ductwork figure 1. Rectangular ducts and fittings made from stainless steel or aluminium are available on request if a higher corrosion protection level is required.
All information provided in this document is to be used as a guideline only. Ductwork after studying this chapter, you will be able to. In fact, design2fab is so easytouse, even a beginner to the trade can make fittings. Flat and vertical duct reducer transition isnt used too often, but because it has a unique layout you may learn how to make this kind of transition as well. Ductwork diy heating and cooling product sales for the doityourself home owner. The layout shows four 4 paths of air flow and six 6 duct sections. The basic principles of duct design, part 1 energy vanguard. This section will describe the uses of the layout and cutting tools and the operation of the forming equipment. Jan 01, 2005 layout for duct fittings indoor environment technicians library leo a. Pipe fittings are piping component that helps in changes the direction of the flow such as elbows, tees. Design information designing your dust collection system. Air flow problems have plagued the hvac industry for years.
Layout and fabrication of sheet metal and fiberglass duct welding quality control. Long radius and reducing elbows, reducing ontherun tees, side outlet fittings. Consequently, the total pressure or total energy of air flowing in a duct system is generally equal to the sum of the static pressure and the velocity pressure. Complete engineering and design shop or onsite manufacturing abrasion resistant piping storage and process vessels duct systems and valves large field manufactured. Download printable pdf file of catalog rect duct product pages.
However, not all situations call for the use off the shelf parts. Equivalent length the amount of duct length added to a duct run by fittings. Various fittings such as elbows and angles may be required to. This catalogue presents the rectangular ducts and fittings sized in accordance with en 1505. Attach 6 round galvanized pipe or other appropriate duct to the takeoff. Rectangular duct and fittings catalog sheet metal connectors, inc. Duct layout for gravity coalwood fired system, 42 62. Helps ductwork contractors quickly and accurately takeoff ductwork from pdf drawings to. Branch ducts are fastened to the main trunk by a takeofffitting. Layout of pipeline internal in a building unit dd 40 872018 11. Changes the size of the pipe such as reducers, reducing tees. Choosing the rightsized duct is critical to maintain proper air flow in the system.
Remember that the molding generates up, so the height will be the measurement from the top of the unfinished floor to the bottom of the duct. Master any situation with principles and shortcuts for laying out the patterns for all the common rectangular and round duct fittings and transitions. Sheet metal duct layout book sheet metal circle scribd. System description ducts are made in two air tightness classes according to pnb76001, ventilation ducts. They should not be located in the same area as the furnace, nor should they be located by moisture sources such as. There are different types of pipe fitting used in piping. Secondary air ductwork runoutsbranches from main to terminal boxes and distribution devices shall be low pressure classification.
All larger fittings are continuously welded except for pcs fittings. Another configuration that may be used in some cases is known as theprimarysecondary trunk system see figure 7. Easy duct technical manual the easy duct advantage simple to install no special tools or training required clamptogether components can be taken apart and reused flexible easily connects to existing ductwork components and adapters fit every system adjustable duct fittings simplify connections. Buy layout for duct fittings by leo a meyer online at alibris. Drawing hvac ductwork architectural home design software. Pipe fittings, joints and valves 5 introduction in unit 4, we studied the importance of measurements in carrying out various plumbing tasks. Design2fab shape library and variations arclight dynamics.