Comprised of two concentric spiral pipes of different diameters with the intervening space filled with insulation (usually fiberglass), dual wall insulated spiral pipe is virtually airtight, and the insulation is protected from the four most common types of failure: job site damage, erosion due to high-pressure, turbulent airflows, and condensation. Spiral Duct Liner Insulation Engineered for use by sheet-metal fabricators with spiral duct capabilities, AP SpiralFlex can be applied in just one simple step and yields a substantially lighter weight duct system than dual-wall systems with fibrous insulation. And round and flat oval spiral duct are neither hard to find or noncompetitive. For all of the above reasons, the minimum gauge used for a vocational woodworking shop dust collection system duct is 22 gauge. — 1” (6” to 90”Φ), 1 ½” (11” to 89”Φ), 2” (14” to 88”Φ) You should have a little bit of metal scraping when you insert a slip fitting into a section of spiral duct. So, we know from ASHRAE and SMACNA that round, flat oval and spiral duct is the way to go for efficiency and low leakage. 3. With no metal inner shell, the product is lighter in weight — as much as 30% lighter in many sizes. For Fastest Service, Call. Pre-insulated ducts and fittings, intended for both indoor and outdoor use. For the relatively small diameters, the gauges are sufficient to avoid collapse. Spiral Pipe of Texas single-wall insulated duct with Spiracoustic Plus® liner may have some advantages for your project over traditional double-wall insulated products. 1″ x 1″ x 1/8″ angle ring reinforcing (12 foot maximum spacing) with 9 stitch welds 1.5″ long. Insulated flat oval duct is increasingly used as an architectural feature in buildings, and we offer the same appearance and finish options as we do for our round ducts. UNILOK-S FLEXIBLE DUCT AUSTRALIAN STANDARD (AS) 4254 (INSULATED VERSION ONLY) FIRE RATED FLEXIBLE DUCT SUITABLE FOR ALL TYpES OF HVAC SYSTEmS UNILOK-S is the professionals choice in flexible duct and has been produced to meet the demands of today’s HVAC systems. Name: Phone: Email Address. These are a wide gasketed clamp with a single tightening bolt. By anyone’s definition, this is an inherently “green” product. But to get those nice rolled duct ends, you have to go to longitudinal seam duct, and that limits your maximum lengths (shorter duct equals more joints to put together) and you end up with a lot of custom lengths or expandable lengths. But if you don’t use those symbols above and indicate you want round and flat oval duct for your project, you will almost certainly get rectangular duct. SPOT has additional literature giving more specific details for our architectural duct products. You’re going to need more hangers/supports – about 50% more. It is important to note that the dynamic airflow performance of a duct system is based on the inner shell, and most duct sizing on mechanical drawings are I.D. The result is 50% more R-value at 20-50% less cost. Your performance is the same as for our other round duct products. Factory-insulated duct products reduce field labor, as well as giving consistency and product features you won’t get with thermal wrap. All of this makes sizing the ducts fairly easy. Woodworking equipment generally pro-duces two types of debris. Within straight sections of trunk ducts, lateral branches with removable caps can be added. Standard Material – our standard product is a 0.75# density Knauf AtmosphereTM Duct Wrap with ECOSE® Technology. These are extremely flexible and can be connected in various positions as per the requirement even in complicated unworkable areas where other ducts cannot reach. That Duct Leakage Class is 4 cfm/100 ft2 at 1” WC. It is the most reliable, durable and permanent method of insulating spiral pipe. Other thicknesses available. Flanking Noise: An HVAC duct system is an ideal conduit for transmitting noise from sources outside the HVAC system. The scope of this guide is as follows: Dust collection ductwork may be fabricated to a more robust standard than typical HVAC duct, but the cost does not have to be egregiously higher. We just usually do it without letting our marketing people put leaves and butterflies on our literature and website. The KoolDuct® board used as our insulation has flame spread and smoke developed indices of 10 when tested per ASTM E84. Thickness — standard 1” and 2” annular spacing. Insulation. Weight-based labor formulas generally allow 50% more pounds per man-hour for installing round and flat oval spiral duct versus rectangular. However, prefabricated elbows of “smooth construction” can be used. You divide that by the prevailing Minimum Transport Velocity (feet per minute). Some equipment has a recommendation for a small-diameter flexible hose of longer length to be used where the attached pickup point is not fixed (blade guards on table saws and traveling heads on radial arm saws). This material is a highly resilient inorganic glass mineral wool with bio-based binders. You’re going to need more duct – the only reasonable way to decrease pressure loss and noise in a duct (other than change its’ shape — which we are trying to get you to do) is to slow the air down. For ducts 12” diameter and smaller, we recommend us-ing the MU Overcollars from METU-System. These are guides for achieving progressive amounts of energy savings toward a net zero energy building and are available for different building types. Most are simply one or two layers of insulating board with an external lagging applied. If that’s the case, please make a big note on the plans — so we know to avoid that project. We recommend a more practical — and less expensive — system of duct connectors. CE Certification. Three standard types of double-wall, round duct are available: spiral lockseam, spiral lockseam with a standing rib, and longitudinal seam. The Master Flow 4 in. Surface Burning Characteristics — Flame Spread 25 and Smoke Developed 50 (tested in accordance with UL 723, ASTM E 84 and NFPA 255. They are most commonly used in conjunction with floor sweeps and shop cleanup. As a result, spiral duct systems usually weigh 30% less than equivalent rectangular duct systems — less material! Wells-Twin Pre-insulated ductwork is used extensively where a high degree of duct insulation is required or where condensation is a problem. Unless noted otherwise, double-wall ducts are fabricated in accordance with Chapter 8 of the SMACNA HVAC Duct Construction Standards Metal and Flexible (Third Edition – 2005) and the outer shells are constructed in accordance with Chapter 3 of the same standard. Such flexible duct should be as short as possible (2 foot maximum length recommended) and have a minimum amount of bending. Houston, Texas 77029 Phone: (713)678-8471 Fax: (713)672-0509 Toll-Free (877)774-DUCT (3828) So, here we have a product — spiral duct — that uses less energy, less material and less labor than other methods of transporting air. Operating Temperature — up to 250°F Spiral Pipe of Texas has been a pioneer in the use of Johns Manville Spiracoustic Plus® round duct liner system, providing some of the largest systems ever produced with outer shell diameters up to 92”Φ. We have been in the business for years and we are well-known as a specialist for various air conditioning systems and equipment. Insulation – It is comparatively easy to insulate a double-wall spiral duct compared to a rectangle wall duct. Overall, interior insulation (duct liners) performs well in terms of thermal efficiency and noise reduction. $15.44 $ 15. At Spiral Pipe of Texas, we make products that meet or exceed the SMACNA HVAC Duct Construction Standards – Metal and Flexible (2005). 99. Angles other than 90-degrees should have a proportional number of segments. InspiralR & Floval: Indoor Pre-Insulated Round and Flat Oval Solutions Give your round and flat oval ductwork the increased performance with Thermaduct’s Inspiral R and Floval Duct Systems. Spiral lockseam duct is constructed with an interlocking helical seam that Even though a saw or sander may not be in use, shutting off the exhaust flow from it would cause a decrease in trunk flow between that equipment branch and the collector. If a joint is designed for disassembly, pre-punched angle rings can be used, and the flanges bolted together. Their recommendation for Ductwork Design and Construction is: “Low-energy use ductwork design involves short, direct and low pressure drop runs. According to the ANSI/SMACNA HVAC Air Duct Leakage Test Manual-2011, the expected leakage performance of a round or flat oval spiral duct system, assembled to a Seal Class A, is a Duct Leakage Class 2. Most leakage for all ducts occurs at the joints, and you are going to have about twice as many duct joints to make with rectangular duct (standard 56” lengths from a TDC coil line) versus spiral duct (commonly supplied in 10’-0” lengths). So, spiral duct is a “green” product made from “green” materials. Your duct is going to leak twice as much – rectangular duct constructed to Seal Class A (transverse and longitudinal seams sealed, openings for rotating shafts sealed) are expected to leak 6 cfm/100 ft2 duct surface area at 1” WG. Our recommendation is to fabricate the main trunk lines of 14” diameter and larger as cut-to-length spiral lockseam pipe and fittings with flanged ends. Table 3 below shows the available sizes of spiral lockseam duct from Spiral Pipe of Texas and their area. Owners and designers want a product that will not wick or retain moisture. Wonder Flange Download and view our Catalogues, A1 = min. Most of the time, for a typical HVAC system, they indicate you want spiral duct. 44. Double Wall Pipe and Fittings With E-Z Flange And Barrel Clamp or Standard Slip Connection Sheet Metal Connectors, Inc. double wall round spiral duct and fittings are one part of our complete line of HVAC products. Engineered for use by sheet-metal fabricators with spiral duct capabilities, AP SpiralFlex can be applied in just one simple step and yields a substantially lighter weight duct system than dual-wall systems with fibrous insulation. Most of the cutting and adjusting happens in the smaller runouts to the shop equipment. Widely demanded in numerous industries, these spiral ducts find application in warm air heating, fume and dust extraction and pneumatic conveying. Whether your choice is internally or externally insulated, Spiroduct Australia's insulated ducting delivers enormous benefits for cooling systems. This allows some movement and positioning of normally fixed equipment. But when you leave them off, you are usually going to end up with poor-performing and costly rectangular duct. Duct insulation is also critical in reducing HVAC system noise. A round duct experiences only about 40% of the wind force a comparable rectangular duct would see. You know your cumulative exhaust flow rate (cubic feet per minute). Insulated Spiral Duct - Design The inner and outer duct is made of sheet metal and the spiral duct diameters – between which a mineral wool is placed. There are three main types of spiral duct fittings: single wall, double wall, and insulated double wall. The one on the right denotes that a duct will be flat oval. Even if someone says their cost per pound is less for rectangular duct, that’s quickly negated because it takes a lot more pounds of rectangular duct to carry the same amount of air. Where possible, we recommend the use of these die-formed elbows with a centerline radius of 1.5. Spiral Duct Liner Insulation. Creating an energy efficient system really comes down to designing the most efficient duct system layout — have the shortest possible distance between the shop equipment and the collector, and get there on the straightest line. The following is our construction standard for positive pressures to +10” WG. The number of fittings should be minimized and should be designed with the least amount of turbulence produced…. It lists the references used here, and most have greatly expanded ranges of size and capacity that can be used for those applications. First of all, flat oval duct is going to work anywhere rectangular would, but without the pressure drops, noise, leakage and weight. It’s usually not very pretty. Your duct’s going to weigh a lot more, and need a whole lot more hardware screwed/welded to it – you’ve probably heard or used the term ”built in accordance with SMACNA”. The thermoquality and smart-looking appearance of our insulated ducting is raising the bar within the industry. You’re going to get more turbulence, and turbulence is bad – you don’t even have to be an engineer to know those square corners of rectangular ductwork cause far more turbulence than no corners (round) or rounded corners (flat oval). Duct Direct 8610 Wallisville Rd. At Spiral Pipe of Texas, our home area of the Central and Southern US encompasses regions with high fluctuations in both temperature and humidity. Dust collection ducts are recommended to be round in shape. Solid – standard metal liner in gauges and construction to contain the insulation and maintain concentricity and structural integrity. Copyright © document.write(new Date().getFullYear());2015 Spiral Pipe of Texas. The problem with this type of fitting is that Minimum Transport Velocity is not maintained. Spiral Insulated Pipe. Hangers should be located as close as possible to joints and elbows (2” recommended) and maxi-mum 12 feet apart. These products can be custom built for your project or can be purchased through a stocking distributor in your area for common diameters and lengths. When sweeping up the shop floor, you close the blast gates on the shop equipment, open the blast gates to your floor sweeps, then turn your dust collector on. Only 1 left in stock - order soon. And it’s pretty easy for you to confirm after a couple of moments on your Ductulator. Installed R-Value — R=4.2 for 1” spacing, R=8.4 for 2” spacing We combine the proven technology of our double-wall duct manufacturing with the properties of Kingspan KoolDuct® to give you the perfect rooftop ducting solution. It also helps to use efficient fittings, and we will go over them below. Ducts can be suspended using appropriatelysized cable hangers, teardrop strap hangers or saddles. Spiral round lock-seam duct is the most efficient way to transport air in HVAC systems. We supply these ducts in different sizes with the diameters (mm) 125, 160, 180, 200, 250, 315, 355, 400 and 450 mm standard from the thermoduct range. The result is Square Feet of duct diameter. Our standard construction uses our spiral duct as the outer shell and a round metal longitudinal-seam duct for the inner shell. Perhaps we should pause a moment to let these numbers sink in. Uninsulated or poorly insulated heating or cooling runs thru spaces with a high ambient temperature differential can give up significant amounts of heat energy to the environment. Thanks for submitting! Temperature Range — up to 350°F This does not mean you can’t get “LEED points” for using spiral duct and fittings. This reduces the drum effect from duct vibration in comparison to a rectangular duct, which can transmit excessive noise if not properly supported. Both round and oval insulated duct and fittings are double walled, consisting of an outer pressure tight shell, a layer of fire resistant or acoustic glass fibre or similar insulation and an inner liner of perforated metal. 1″ x 1″ x 1/8″ angle ring reinforcing (12 foot maximum spacing) with 9 stitch welds 1.0″ long, A2 = min. 11. Thermaround Healthcare Outdoor Seamless Spiral Duct … We can provide the inner and outer metal shells as galvanized steel (standard), paint-grip galvanized steel, epoxy powder-coated steel, PVC-coated steel, black iron, aluminized type 1 steel, 3003-H13 aluminum, 304 stainless steel or 316 stainless steel. So not only do you have to increase the amount of duct (perimeter) to reduce pressure loss and noise, you also have to increase the weight of that perimeter to reduce deflection. We offer spiral lockseam construction, tack-welded and sealed construction, MIG and TIG welding. of longitudinal joint sealing100 feet / 56 in/section = 21.43 sections = 21 joints21 joints x 72 perimeter inches = 1,512 lin.in. As ducts from different shop equipment merge into the trunk, the highest of the Minimum Transport Velocities must be maintained from that point to the collector. ... oldest and biggest British Independents in the business and offer by far the widest range of standard and tailor-made spiral tubes in Europe. Round duct is preferred over rectangular duct. The main trunks of dust collection systems are relatively straight runs in predictable and fixed positions. Part of the requirement involves the Since this type of insulation is within the air stream, it must be designed to minimize insulation particulates from entering the air stream, and to prevent the formation of molds and bacteria. The idea of a system you can put together with external V-clamps sounds great, and you certainly avoid putting obstructions into the airstream like you would with traditional screw-and-glue HVAC duct joints. Temperatures above 250°F can also degrade the insulation. 8. Density — 4.0 pcf Surface Burning Characteristics — Flame Spread 25 and Smoke Developed 50 (tested in accordance with UL 723, ASTM E 84 and NFPA 255) It is used to reduce heat gain or loss while also absorbing unwanted crosstalk, equipment and air rush noise. You’re not going to have an easier time fitting the duct into the allotted space – there seems to be this mistaken idea that if ceiling space is tight or congested, your solution is to use rectangular duct. Install & tech info - all registers. It is an excellent structural standard that’s mostly showing you one thing — how to limit deflection. Bacteria Resistance — no growth (ASTM G22), The slightly-less-short answer is: “If you are not using spiral ducts from Spiral Pipe of Texas, then you aren’t really green at all.”. It should be noted that not all “die-stamped” or “pressed” elbows meet the minimum gauge requirements. FREE Shipping on orders over $25 shipped by Amazon . However, the actual requirements for a duct system in this application are higher and involve other standards. In addition to durability, that is also the lightest gauge that can be consistently welded in most production facilities. Economical, quick and easy to install this Flexible Duct - NudeWire Core are fabricated in tandem with the international quality standards. Most HVAC ducts need to be insulated. We simply developed a way to use the best rooftop metal duct fabrication — SPOT’s double-wall round spiral duct — with the best rooftop insulation material — Kingspan’s KoolDuct® phenolic system. The use of the gasketed MU Overcollars will eliminate most leakage at joints and cleanouts. Unlike the traditional duct, spiral duct is lighter and it’s made of standardized components which are manufactured with precision, hence lowers installation costs. Master Flow Duct Sleeves Premium Duct Insulation. Philippine Spiral Duct Manufacturing Incorporated or PSDMI is all about giving you quality products at the best value for your money. Fittings have male ends with a slightly smaller diameter to press-fit into duct.. Galvanized steel has good corrosion resistance. Round/curved surfaces have little-to-no deflection in positive and low pressures. So if you pick an example from the chart above where rectangular duct weighs 50% more than spiral round duct, it only takes 44% of the labor to install the spiral round duct compared to the rectangular. It can be used as a main trunk line or branch line, as well as in return air situations. The demand for antimicrobial products is increasing. Your Round Solution for Rooftop HVAC Duct Systems. But the need for Minimum Transport Velocities prevents design methods such as static regain from being used to reduce system pressure drop. This guide is not intended to cover commercial and industrial woodworking facilities. The Knauf product contains three primary ingredients: 1) sand — one of the world’s most abundant and renewable resources; 2) a minimum 50% recycled post-consumer glass content; 3) a new binder technology that reduces binder embodied energy by up to 70% and features bio-based materials rather than non-renewable petroleum-based chemicals traditionally used.

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