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