rigid duct 2—2012 Australian Standard® Ductwork for air-handling systems in buildings Part 2: Rigid duct AS 4254. unitedpower. I'm getting bids to replace the duct work in my 1930 bungalowexisting ducts are plastic flex ducts that are 20+ years old and sagging and have holes from animals etc. It's tempting to use plastic or foil flexible ducting to connect the dryer to the vent; they are inexpensive and easy to connect. http://www. Free Shipping on orders over $35. Duct Rigid Averaging Temperature Sensors with T1K or T10K Transmitters feature closed cell foam to seal the probe insertion, mounting tabs for easy installation and etched Teflon lead wires and double encapsulated sensors to create a watertight package. Flex duct allows easy connection from the main duct trunk to the To size a flex duct you utilize the same methods as if you were sizing regular HVAC rigid duct. After measuring and cutting the section to the proper size, align You can convert a section of rigid duct to flexible duct. Allied Tube & Conduit offers a complete line of rigid PVC . If you are looking for Flexible & Rigid Ducting at unbeatable prices, please visit Cotterill Civils online now. These rigid duct fittings are pre-insulated and pre-sealed with mastic on one of Matt Risinger's jobsites. Semi-Rigid ducting for whole house ventilation systems. Flexible semi-rigid aluminum triple-lock design for more durability Ideal for both gas and electric dryer installations UL 2158A listed and labeled as a clothes dryer transition duct Product Contains: (1) – 4″ x 8′ UL 2158A Semi-Rigid Aluminum Transition Duct Friction loss or major loss in air ducts - equations and online calculator for rectangular and circular ducts - imperial and SI units Wire duct is used to route, protect and/or organize electrical cables and wires, typically within a control panel. The semi-rigid aluminum duct is ideal when all aluminum duct is required by code in some gas and electric dryer applications. The Facts About Clothes Dryer Exhaust Systems JOHN CRANOR. CHAPTER 6 DUCT SYSTEMS SECTION MC 601 Class 0 or Class 1 rigid or flexible air ducts shall not be used for air ducts con-taining air at temperatures in excess of Find great deals on eBay for rigid ducting. Over 1. Title 24 Requirement Use the largest possible duct diameter, preferably in smooth rigid duct rather than flex duct. x 8 ft. conduit and fittings and PVC utility duct. com. O. CB FT3CS. in SMACNA PVC Duct ductwork wherever necessary to insure rigid connection House fires related to clothes dryer vents are much more common than most people believe but luckily Notice how this rigid metal duct looks nothing like the mylar PVC duct pipe & fittings specifications, pvc pipe dimensions, properties, installation, and welding for your PVC ductwork system. So why are foil ducts allowed? Knauf Insulation Rigid Plenum Liner with ECOSE® Technology is a heavy-density mat-faced glass ventilating and air conditioning plenums and sheet metal ducts. Semi-Rigid Aluminum Ducting. Product Code PhotoSpecsProduct DescriptionPackedCase PackCS. Aluminum Semi-Rigid Duct with Connecting Ends - Pack of 20 Shop and Save on Broan Ducting. MANUFACTURER It has a fully adjustable centre disc and may be used for internal use within duct or in-line fans where there is more than one extract point. Supplier of Galvanized sheet metal duct, hvac duct supplies, air conditioing ductwork, flex duct, round, dampers Fiberglass air duct insulation: rigid duct insulation board uses, features, concerns, Q&A on use of rigid insulating board to build air conditioning or heating ducts Tools used to construct rigid fiberglass insulated HVAC ductwork How to use fiberglass duct board to construct HVAC ductwork Use of rigid duct board with a thermosiphoning air One of the main aspects of duct design is the type that will be used, either flexible or rigid. Titon’s plastic duct silencers available in 204mm x 60mm and 220mm x 90mm have been designed for high flow rate installations with low pressure drops. A duct system is also called ductwork. oped index of not more than 50 when tested in accordance with ASTM E 84. You can build ducts from rigid foam board to serve as the distribution system to circulate heated or cooled air in your house. 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Owens Corning FOAMULAR commercial foam insulation selection guide with links to specific FOAMULAR rigid foam board insulation product descriptions Duct Rigid Averaging Temperature Sensors with T1K or T10K Transmitters feature closed cell foam to seal the probe insertion, mounting tabs for easy installation and etched Teflon lead wires and double encapsulated sensors to create a watertight package. Supplier of Galvanized sheet metal duct, hvac duct supplies, air conditioing ductwork, flex duct, round, dampers Product Features 8-foot length dryer vent duct with two clamps for wall and dryer connections Heavy-duty applications like chemical plant ventilation and automobile exhaust systems need flexible duct hoses that can withstand the abusive environment, extremes in heat, and corrosive chemicals. 06" on most metal duct calculators FIELD DUCT SIZING CHART Flex duct = . Diameter: 4"; Length: 8'; Order # : R94-077 Brand : Ducting & Sheet Metal Sheet Metal; Flex Duct; Duct Hardware; Duct Board, Wrap, Liner; Duct Board vs Sheet Metal indoor use to 200 micrometers for external use in order to guarantee the high mechanical characteristics of the duct. html It is insulated with fiberglass sleeves, most of which is covered in Venting Guidelines Search form. 2—2012 This is a free 6 page sample. A bad rigid install can create an healthy SP drop. Eligible for FREE UK Delivery. Shop for rigid ducts at Ferguson. Currently I have dryer venting with a flexible duct (aluminum foil like). DESCRIPTION K-Flex Duct® Liner R-6 and R-8 Black Insulation is an environmentally friendly, CFC- and HCFC-free, closed-cell, flexible elastomeric thermal and acoustical insulation. Above data is for air density of 1. After doing some research on the semi-rigid dryer transition ducts, I've learned that they might not be allowed in Minnesota. I’ll show you how to replace it with semi-rigid duct to keep you and your home safe from a dryer fire. Duct Design. Advanced Duct Systems supplies Australian industries with the worlds leading rigid and flexible modular duct systems, at extremely competitive prices. Duct insulation minimizes conductive heat losses and gains, allowing supply air to High quality, market leading Domus range has a vast selection of PVC round ducting! Domus rectangular Range has 3 different sizes 100 /125 and 150mm and consists of: Duct Insulation and Installation: A Quick Guide for Contractors lower friction rate than flex ducts or rigid fiberglass duct Marley rigid cable duct made from uPVC has a long design life ensuring premier durability where power, communication and fibre optic cables need protection in trenched applications. Rigid Duct Insulation Duct Surface *U. Planning ductwork manufactured from rigid insulation panels does not need any further insulation and can be installed I'm getting bids to replace the duct work in my 1930 bungalowexisting ducts are plastic flex ducts that are 20+ years old and sagging and have holes from animals etc. The insulation is quite low around R-4, and also has many tears and rip Photo tutorial showing how to insulate round sheet metal air duct with R-8 thermal insulation Adjustable elbows and rigid duct board distribution box connection. This product does not comply with the Safe Drinking Water Act, which requires that products used in any system providing water for human consumption (drinking or cooking) to meet low-lead standards. High quality, market leading Domus range has a vast selection of PVC round ducting! Domus rectangular Range has 3 different sizes 100 /125 and 150mm and consists of: Supplier of Quality HVAC Sheet Metal Start Collars on Round & metal HVAC Fittings for All of Your Heating and Air Conditioning needs. Rigid and flexible ducts and connectors shall con-form to Section 603. Get fair costs for your SPECIFIC project requirements. Dryer Transition Hose (Exhaust Duct) Comparison Reviewing Semi-rigid Aluminum, Foil and the new Standard for Performance and Safety--DryerFlex Hello! I have a ~20 yr old home with flexible HVAC ducting in the attic. Find great deals on eBay for Semi Rigid Ducting in Home Extractor Fans. Some are flexible and others are rigid. Semi-rigid metal dryer transition ducts are available anywhere dryer duct materials are sold, but it's almost impossible to find a UL Listed version of this. SUBURBAN SHEET METAL LTD Mailing Address P. All Products: Glass Chair Mat: Semi Rigid Flexible Vinyl Insulated Accessories. Discover the Lowest Prices & Best Customer Service - Smarter Home Improvement Shop Rigid Non-Metallic Split Duct PVC Conduit by Prime Conduit (49011SD-010) at Graybar, your trusted resource for PVC Conduit and other Prime Conduit products. Sizes range from 32mm to 150mm and are available in 6m socketed lengths. Competitive prices & free delivery for orders over £75. A guide to proper installation and sealing Manual D is the residential duct design manual that is published by the Rigid duct insulation board is also used to Rigid ducting. It is spiral wound with a unique interlocked and Rectangular Ductwork, Plenums, and Takeoffs. https://www. Flex duct installations tend to be sloppier than rigid duct because they can. Installing Semi-Rigid Dryer Hose to Prevent Fire Hazard. One end of each piece is crimped for easy fitting of consecutive joints or to sheet metal fittings and flexible duct. Most of the runs are taut, but there is one in particular that goes for One of the main aspects of duct design is the type that will be used, either flexible or rigid. I've discovered a dryer transition duct that is far superior to anything else I've ever seen - it's called DryerFlex. Hoods/Vents Shop flexible duct in the hvac duct & fittings section of Lowes. House fires related to clothes dryer vents are much more common than most people believe but luckily Notice how this rigid metal duct looks nothing like the mylar Rigid Averaging Units feature closed cell foam to seal the probe insertion hole, mounting tabs for easy installation and etched Teflon lead wires and double encapsulated sensors to create a watertight package. More buying choices. rigid straight terminal unit inlet length shall be a minimum of 3 times the diameter of inlet Supplier of Quality HVAC Sheet Metal Start Collars on Round & metal HVAC Fittings for All of Your Heating and Air Conditioning needs. by Ventilation Centre. The duct is totally non-combustible with a maximum operating temperature of 400°F. Pce Wt. It is spiral wound with a unique interlocked and knotted continuous seam. Duct insulation minimizes conductive heat losses and gains, allowing supply air to The vent outlet for a typical dryer is behind the machine at the bottom, and it seldom lines up with the vent pipe that leads to the outside of the house. To qualify for some energy efficiency rebates, we needed to insulate 25' of the HVAC supply ducts in our basement. In the Project Browser, expand Views (all)Floor Plans, and double-click the mechanical view where you want to convert a rigid duct to a flexible duct. We stock a wide range of Ducting Pipe that Semi-Rigid Metal Ducts. Free delivery over £75. 2 kg/m3 The Best System DUCT DUCT Rigid extruded urethane or polystyrene board (foil faced) W at ers h e d D esi gn Insulation Pins 5 mil self adhesive membrane (on bottom ONLY) 2015-2016 Commerical & Industrial Hoses Vacuum Arctic Duct 3 Two single-ply Medium weight clear co-extruded polyolefin elastomer hose with a rigid green WSEC Builder’s Field Guide 8th Edition, 2009 • Washington State University Extension Energy Program Supplement F - 1 Common Duct Insulation Materials DESCRIPTION K-Flex Duct® Liner R-6 and R-8 Black Insulation is an environmentally friendly, CFC- and HCFC-free, closed-cell, flexible elastomeric thermal and acoustical insulation. Shop for rigid 12" galvanized duct pipe at Grainger. S. The house that I used to live in, we replaced the flex duct with rigid. Our market leading Domus rigid duct range is available in 8 different profiles to suit any application and comes with a full set of adapters to enable a simple or complex system as required. pdf Semi Rigid Aluminium Duct Semi-rigid aluminium ducting is a lightweight, flexible but strong corrugated aluminium duct. Raylum is a high quality aluminium, Triple Lock Flexible Ducting. Most of the runs are taut, but there is one in particular that goes for Allied PVC conduit and duct is for commercial, industrial and utility usage; durable and effective in underground, encased and exposed applications Our duct wrap is available in a variety of densities, XSPECT ISOfoam APF board offers one of the highest R-values of any rigid insulation available, Hello! I have a ~20 yr old home with flexible HVAC ducting in the attic. Since all types are sold for use with dryers, you would naturally assume that all are suitable for this application. PVC duct pipe & fittings specifications, pvc pipe dimensions, properties, installation, and welding for your PVC ductwork system. Available in convenient lengths to suit site requirements. Quick-Fit, clamp-together, modular ducting systems, were introduced by Nordfab over 25 years ago. Rigid Insulated Ducting with bends, elbows, reducing connectors, couplings and adaptors for 125mm, 150mm and 180mm diameter. Haven't tried yet, but was wondering whether the semi rigid aluminum ducting can be flexed to shape to fit in this setup or not. I am comparing quotes for a new AC installation. 06" on most metal duct calculators FIELD DUCT SIZING CHART I decided to replace all the flexible trunk duct at the supply air plenum with rigid round sheet metal duct. what are semi-rigid air ducts? flexivent semi-rigid plastic air ducts - a flexible solution for your home: flexivent - energy-saving ventilation for your home Round Ductwork Installation Tips. Semi-rigid aluminum duct is ideal for applications where building codes require use of all aluminum duct. Most conduit is rigid, Wall duct raceway is the name give to the type that can be enclosed in a wall. Metal/Insulated Quote: Originally Posted by MechAcc. Rigid seamed exhaust duct ideally should be installed with the seams up to prevent any accumulation Wide range of general purpose rigid underground ducting - wide variety of sizes available, from 54mm to 200mm. Marley rigid cable duct made from uPVC has a long design life ensuring premier durability where power, communication and fibre optic cables need protection in trenched applications. Our duct is primarily used in large scale industrial ventilation applications like welding fume extraction, chemical fume extraction, dust collection systems, factory ventilation, and all manner Duct Fabrication Specifications & Duct Construction. Concealed ducting must be rigid metal (galvanized or aluminum) duct. 6. 61 per linear foot, but can vary significantly with site conditions and options. Next Day Shipping to all of the USA. 215 Rigid S-Strip ½" x 1" No. Easyflex is a semi-rigid, corrugated air duct made out of polyethylene with an external diameter of 140x64mm and an equivalent inner diameter of 90mm. com/r The problem My vented attic in Virginia has a straight 28ft of 12" x 8" rigid rectangular trunk duct with seven 6" branches. Whats the difference between rigid and flexible duct. 05" on most metal duct calculator Round metal pipe = . Image Credit: Energy Vanguard Our market leading Domus rigid duct range is available in 8 different profiles to suit any application and comes with a full set of adapters to enable a simple or complex system as required. Manrose rigid plastic ducting, 100mm diameter x 1m long, pipe. The exhaust duct should be rigid then the source of the problems may not be the dryer at all but may actually lie with the exhaust duct. All Duct is Cross broke except 8"x8" Duct Hangers: No. Our duct is primarily used in large scale industrial ventilation applications like welding fume extraction, chemical fume extraction, dust collection systems, factory ventilation, and all manner The vent outlet for a typical dryer is behind the machine at the bottom, and it seldom lines up with the vent pipe that leads to the outside of the house. Available in a wide range of sizes. Our MFX48 semi-rigid aluminum duct is UL Approved and fire resistant to 435 Rectangular Ductwork, Plenums, and Takeoffs. AS 4254. 00. We carry wire duct in different forms like narrow slot, open slot, solid wall or noryl. How to Install Round Sheet Metal Duct In our Texas climate a well installed HVAC system is a must for a new home. In the HVAC world, there's a bit of debate on the merits of rigid versus flex ductwork. For sealing joints in ducting providing a flame retardant vapour barrier. The Hybalans 75mm 92mm Semi Rigid Duct system offers 100% successful air distribution, a flexible modular system, and is the best solution for any project My 30-year-old house HVAC is put together with semi-rigid duct in the attic. £14. Rigid, fiberglass duct liner with a glass mat airstream surface, coated with an antimicrobial coating, designed to insulate plenums and duct work (Service temp: 250°F) Rigid / Semi rigid thermoplastic ducting for use in complex duct geometries and restricted space envelopes flexible ductwork vs rigid ductwork air conditioning semi rigid aluminum duct fireproof round 8 flexible aluminum duct. Semi-Rigid Dryer Duct WX08X10075DS, UL approved this duct is easy to install with the 2 included clamps at The Home Depot Shop hvac duct & fittings in the heating & cooling section of Lowes. Enjoy the 8 ft. A hybrid approach to transitioning to flex duct and the benefit of silence. 26 - $16. The DryerFlex dryer transition duct is a cross between foil and semi-rigid aluminum, but it outperforms both of those materials in every way possible. Dryer venting tips and practices. Can someone tell me whether there are any significant disadvantages for using flex duct for supplies (off the main trunk) rather than rigid metal ducting? Speer Mechanical’s Kingspan KoolDuct air duct system reduces energy use, CO2 emissions, and whole life energy costs, lightweight and easy to install. FX0018 3" x 8' Aluminum Semi-rigid Duct FX0022 4" x 8' Aluminum Semi-rigid Duct FX0026 5" x 8' Aluminum Semi-rigid Duct Wiring ducts are rigid trays typically used as raceways for cables and wires within electrical enclosures. The insulation is quite low around R-4, and also has many tears and rip The Uniflexplus+ Semi-Rigid Range sets the standard for easy to install, low profile ducting solutions. Flex Duct Vs. Method for providing a rigid duct (1) with an annular seal located on the inner surface of a mouth of the same rigid duct (1) or the outer surface thereof. MC mounting clamps are designed for use with rigid duct. 4,936,938; 5,096,759; and 5,142,873 aluminum. A rigid Knauf Insulation Rigid Plenum Liner with ECOSE® Technology is a heavy-density mat-faced glass ventilating and air conditioning plenums and sheet metal ducts. Spunstrand Inc. Rigid Duct Ø100mm Outlet Louvered Grille with and without Flyscreen Choosing The Right Dryer Venting Duct; About Dundas Jafine. has a variety of duct configurations Since 1960, Spunstrand Inc. Heating, Cooling, Product - Lambro 3010 3 in. Search . Thanks always 10 (25. Find great deals on eBay for rigid duct. I found this online that recommended using rigid Polyisocyanurate foam board to insulate the ducts. Rigid PVC Conduit & Fittings. See current photos aluminium semi rigid duct,stainless steel rigid ducts,aluminium semi rigid ducting,stainless steel semi rigid ducting,aluminium rigid duct,stainless steel rigid duct,dryer duct Appliance411 FAQ: How long can my dryer vent be? It may be best to avoid this material for this application if you can use rigid metal ducting instead. instagram. 209 Owens Corning FOAMULAR® 150 Rigid Extruded Polystyrene (XPS) Foam Insulation is the ideal insulation for exterior walls, featuring superior moisture prevention and a lightweight feel. com/buy/applianuct-64218. ToughGard® Fiber Glass Duct Board is a rigid butt edged board with a durable airstream surface with exceptional resistance to tearing, puncturing & wear. com/documents/InsulateYourDuctWork_000. Flex duct = . 2015-2016 Commerical & Industrial Hoses Vacuum Arctic Duct 3 Two single-ply Medium weight clear co-extruded polyolefin elastomer hose with a rigid green Vast range of underground ducting - general purpose rigid & flexible cable ducting supplies. 2. Our range of ducting includes flexible ducting, semi rigid ducting, fire rated duct and insulate ducting. CS Wt. Featuring unique rolled edge ends and easy-to-use clamps, Nordfab ducting parts provide the highest standard of efficiency while decreasing downtime by half. PRODUCT NAME CertainTeed ToughGard® Rigid Liner Board with Enhanced Surface Fiber Glass Duct and Plenum Liner Insulation 2. 5 million maintenance, repair & operations (MRO) products. There’s no question that flexible duct is easier to install than metal ductwork, but consider this: The semi-rigid aluminum duct is ideal for applications where code requires an all aluminum product. Galvanized Sheet Metal Ducts from The Duct Shop's HVAC ductwork is manufactured from high quality galvanized steel in 3 foot lengths for easy handling. About 10 years ago, I had three 10" diameter runs of insulated flexible duct installed by an HVAC contractor to go from my basement forced air furnace Providing the trade and consumers with quality, innovative products for home and commercial air extraction and ventilation, and clever lighting and sensor lighting products. Find your rigid air duct easily amongst the 26 products from the leading brands on DirectIndustry, the industry specialist for your professional purchases. 3. As with all duct systems, it is essential that one built from rigid foam board is correctly designed so that the temperature is comfortable and consistent throughout the Impulse Air manufactures spiral ducts & fittings Flexible ducts, Rigid ducts, Magnesium ducts, Ferrous alloy & Titanium ducts. KIMMCO Duct Insul Plus is manufactured from stable glass fibres bonded with thermo-setting resins, in the form of blankets, semi-rigid or rigid boards with factory applied Aluglass (Aluminium foil/glass fabric laminate) facing as vapour barrier Best North American Duct Manufacturers and Brands - Flexible, Rigid, Spiral Duct - US and Canada - Complete list with reviews. rigid duct? The problem is with flex having a measurable standard to compare with. 5. A clothes dryer Item Description. com Our range of ducting includes flexible ducting, semi rigid ducting, fire rated duct and insulate ducting. Ferguson is the #1 US plumbing supply company and a top distributor of HVAC parts, waterworks supplies, and MRO products. 4. Innerducts. Aluminum Semi-Rigid Duct (10 diameter). html It is insulated with fiberglass sleeves, most of which is covered in Find your rigid air duct easily amongst the 34 products from the leading brands (SCHAKO, ) on ArchiExpo, the architecture and design specialist for your professional purchases. Patent Nos. So why are foil ducts allowed? Flexible Ducting Lightweight PVC ducting. nts duct connections - air terminal units note: 1. The internal steel helix resists distortion during installation. Shop ducting and ducting accessories at VentingDirect. RAYLUM – Semi Rigid Aluminium Flex Ideal for heating or cooling applications. This duct is totally non combustible with a maximum operating temperature of 435°F. SPIRAL ROUND DUCT SYSTEMS TAMBE METAL PRODUCTS nergy Efficient ost less to install ften requires less space eeds less hangers peration costs lower ore noise free Choosing The Right Dryer Venting Duct; About Dundas Jafine. Working with abrasive materials requires tools and machinery that can handle the movement of rough materials with little damage via collection ducts or any attached devices. Rigid Steel Duct, Wholesale Various High Quality Rigid Steel Duct Products from Global Rigid Steel Duct Suppliers and Rigid Steel Duct Factory,Importer,Exporter at Alibaba. Split Duct Unique tongue-and Joints may be sealed with tape and reinforced with plastic or metallic straps to produce a rigid, stable unit. 4cm) dia. Find out more about the most common ductwork for central air conditioning, This kind of ducting is best in tricky spaces where rigid ducts are just not Round Rigid Ducting with Straight/Offset Reducers, Flat plastic ducting and Equal Tee pieces The problem My vented attic in Virginia has a straight 28ft of 12" x 8" rigid rectangular trunk duct with seven 6" branches. Design the Duct System. Buy Deflecto Semi-Rigid Flexible Aluminum Duct, 5" dia x 8' at Walmart. 209 Here's a simple way to make sure your duct system gets good air flow and has a lower risk of failure. Floor Protection. Our MFX48 semi-rigid aluminum duct is UL Approved and fire resistant to 435 Semi Rigid Ducting Semi-rigid aluminium ducting is a lightweight, flexible but strong corrugated aluminium duct. We carry a great selection on all ducting products. Innerducts are Rigid, Semi Rigid & Flexible Duct Rigid, Semi Rigid & Flexible Duct 10 Spiro-loc - Rigid Duct Performance Data – SPIRO-LOC Notes 1. KG. The foam neoprene layer creates an air tight and solid installation for in-line duct fans. Duct and Conduit 473 Chapter 14 • Electrical Conduits – UL 651A Type EB and A Rigid PVC Conduit and PE Conduit – UL 651B Continuous Length PE Conduit UL 2158A duct is highly recommended for clothes dryer venting installations. Come see how my crew uses both Rigid Metal & Flex for great air distribution in the homes I build. Eaton has been designing and manufacturing ducting and tubing components for more than thirty years, specializing in the design, analysis, testing and manufacture of aircraft air ducting systems for the distribution of engine bleed air, anti-ice and environmental control air throughout the aircraft. Aluminum Duct Products. I'm surprised by how few builders are using Rigid Metal ducting anymore. Dryer vent pipes properly called vent ducts, come in a variety of materials. Buy online! Find out more about the most common ductwork for central air conditioning, This kind of ducting is best in tricky spaces where rigid ducts are just not Rigid Duct The installation of rigid duct (ductboard) is the preferred choice of contractors and designers as an economical and effective solution which provides exceptional acoustical and thermal performance. The rigid ducts flow alot more air, and there is no problem with it collapsing. Find quality hvac duct & fittings online or in store. Find quality flexible duct online or in store. This is a range of highly efficient ducting, suitable for long duct runs, cooker hoods and kitchen extraction fans. a d v a n c e d i n s u l a t i o n Armacell Duct Liners Fiber-Free Solutions for Healthy, Energy-Effi cient, Sustainable & Quiet Air Delivery . Box 739 Kennedale, TX 76060 Physical Address 528 S. Exceptions: 1. rigid duct