Actually, it’s even easier to install than our fiberglass insulated products. The products and methods we recommend are chosen to meet the requirements in the most cost-effective way. It carries a GREENGUARD Gold Certification. Spiral Duct Australia Pty Ltd is a leading manufacturer of spiral duct. Most of the time, for a typical HVAC system, they indicate you want spiral duct. 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. It has lower pressure drops, saving fan horsepower, and there is less heat gain/loss through the surface than with rectangular shapes. The 4-ply spiral lock-seams of “spiral duct” create a product that is stronger than traditional welded-seam round ducts of the same gauge. 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. You’re going to have a hard time meeting the ASHRAE Standard 90.1-2013 Energy Code – it states “Ductwork and all plenums with pressure class ratings shall be constructed to Seal Class A, as required to meet the requirements of Section 6.4.4.2.2…” (the Duct Leakage Class). But there are many specialty duct systems that fall under lesser known standards and criteria. These have neither the strength nor durability of double-wall metal construction. Table saws, lathes, joiners and planers produce larger chips. Your performance is the same as for our other round duct products. 5. Rooftop duct should always be round when possible. Straight duct construction – available as spiral lock-seam duct (corrugated and non-corrugated) and welded longitudinal-seam duct. spiral duct manufacturer/supplier, China spiral duct manufacturer & factory list, find qualified Chinese spiral duct manufacturers, suppliers, factories, exporters & wholesalers quickly on Made-in-China.com. AgION™ antimicrobial-coated steel ductwork is durable and should be incorporated into HVAC systems. USA has over 20 years’ experience manufacturing Spiral, Oval, and Rectangular Duct Pipe Systems. We really hate to plug our competition, but within a 600-mile radius of our plant in Ft. Worth, Texas you can find more than 100 spiral duct machines and at least 15 ovalizers. AccuDuct Manufacturing began providing products to the HVAC industry in 1987. Standard 1” thickness (larger annular thicknesses obtained by wrapping successive layers) with R-value R=4.2. 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. Our high pressure spiral duct, round ductwork, and flat oval duct — in comparison to traditional rectangular duct — is ideal for a number of different applications in a variety of industries, including construction, manufacturing… 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. Most HVAC duct systems use “barrel” type fittings where the branch enters a constant-sized trunk. 6. All PCD and SPOT Agion fittings are riveted and sealed. Create lists of frequently purchased items for fast ordering. GREENGUARD Gold Certified. Biyang began providing ducting products since 1995. Cleanouts should be used in horizontal duct runs, near elbows, junctions and vertical runs. … You should do a separate system calculation to determine that your fan, with only floor sweeps open, can maintain the Minimum Transport Velocity for the cumulative floor sweeps of 4,000 FPM to avoid potential clogs. Impulse Air   |   2126 W 21st St   |   Jacksonville, FL , 32209-4110   |   P: 904.475.1822   |   F: 904.355.2104. The KoolDuct® board used as our insulation has flame spread and smoke developed indices of 10 when tested per ASTM E84. They are most commonly used in conjunction with floor sweeps and shop cleanup. Built-Up Insulation Board with External Lagging, Vocational woodworking shops in secondary and technical education facilities, Duct systems operating at -15” WG and less, Systems in operation less than 1,000 hours per year, Industrial Ventilation — A Manual of Recom-mended Practice for Design (30th Edition – 2019) — ACGIH, Round Industrial Duct Construction Standards (2nd Edition – 1999) — SMACNA, NFPA 91 – Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Particulate Solids – 2020 — NFPA, Chapter 19 “Duct Construction” — 2016 HVAC Systems and Equipment Handbook — ASHRAE, Chapter 21 “Duct Design” — 2017 Fundamen-tals Handbook — ASHRAE, Chapter 8 “Educational Facilities” — 2019 HVAC Applications Handbook — ASHRAE, Chapter 33 “Industrial Local Exhaust Systems” — 2019 HVAC Applications Handbook — ASHRAE. The company was established in 1991, and markets its products in the states of Florida, Georgia, North and South Carolina, and Alabama. It will not perform as well, it will probably cost more, and you will have done the owner no favors. Proper spiral duct systems follow tolerance standards that minimize the gap between male-sized fitting and coupling ends and the female-sized ends of spiral duct. Hamlin Offers Full-Service Duct Manufacturing Capabilities Hamlin Sheet Metal is a nationwide provider of round, flat oval, rectangular, and spiral duct systems, as well as welded ducts. Mold Growth — no growth (ASTM C 1338) Angles other than 90-degrees should have a proportional number of segments. engineering info, submittal forms. Though sometimes specified, they make duct assembly with slip-fit transverse joints more difficult, create thermal bridges between the interior and exterior of the duct, and have a negligible effect on actual R-value. ASHRAE research projects prove better performance from round and flat oval ducts. Also, we offer both round and flat-oval spiral … The demand for antimicrobial products is increasing. Dust collection systems are typically designed using the Constant Velocity method. We are limiting customer service interactions to PHONE and EMAIL ONLY however our offices are closed to in-person visits. Traditional Craftsmanship Because round ducts are inherently stronger than rectangular profiles, they can be lighter metal gauges and can be installed in longer spans. Example #1100 lineal feet of 18”φ spiral ductTen 10’-0” lengths of spiral duct = 9 joints18” x π x 9 joints = 509 lineal inches of sealing, Example #2100 lineal feet of 24 x 12 rectangular duct100 ft x 12 in/ft x 2 longitudinal seams = 2,400 lin.in. For all of the above reasons, the minimum gauge used for a vocational woodworking shop dust collection system duct is 22 gauge. Round is also the strongest shape for transporting air. © 2020 Impulse Air. Learn more about Anti-Microbial Duct products. With no metal inner shell, the product is lighter in weight — as much as 30% lighter in many sizes. Most are simply one or two layers of insulating board with an external lagging applied. We can provide the metal shells as spiral duct or longitudinal seam welded duct, and in thicknesses from 10 gauge through 26 gauge. 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”. Per this standard, all ducts should be constructed and installed to meet a Duct Leakage Class 4, regardless of whether testing is required or not. Your Round Solution for Rooftop HVAC Duct Systems. But let’s take this a few steps further. Give us a call at 904-475-1822 or email us They have been proven to have almost no inherent leakage. A spiral seam makes this duct strong and rigid. The majority of the … All products are manufactured at the company’s sole location in Jacksonville, Florida. Frankly, one of our greatest concerns we try to prevent is unintentional damage caused by the users. support spacing is 12’-0”. Here are some of them. The SMACNA manual will have you increase the gauges or add reinforcing to limit deflection. Houston, Texas 77029 Phone: (713)678-8471 Fax: (713)672-0509 Toll-Free (877)774-DUCT (3828) More and more owners and engineers are requesting it for its effectiveness in inhibiting the growth of damaging bacteria, mold and fungi. This Spiral Pipe … Standard Material – our standard product is a 0.75# density Knauf AtmosphereTM Duct Wrap with ECOSE® Technology. 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. That’s most often referring to the “2005 SMACNA HVAC Duct Construction Standards – Metal and Flexible”. At Spiral Pipe of Texas, we only use 20 gauge die-formed elbows for this type of system, and only where the system design pressure allows 20 gauge construction in that size. For the larger primary trunk ducts, removing a section for cleanout is less desirable and practical. And with slip-joint construction you trim duct lengths of round and flat oval spiral ducts without compromising their integrity or performance. The insulation is protected from external damage — a critical concern for ductwork on rooftops and out of the building envelope. We are a lot less expensive than the other closed-cell insulated duct products — elastomeric, foam-filled and even other phenolic products. The result is Square Feet of duct diameter. Fungi Resistance — does not breed or promote (ASTM C1338), no growth (ASTM G21) As a result, spiral duct systems usually weigh 30% less than equivalent rectangular duct systems — less material! The internal metal shell gives protection from insulation erosion, maintains a smooth duct cross-section, and makes cleaning the ducts easier. It is also less likely to … However, space (height) restrictions may require flat oval duct to achieve the low turbulence qualities of round ductwork.”. Biyang is a recognized prominent manufacturer of all ranges of flat oval spiral ducts, flexible duct, and round duct in China. Since 1981 Spiral Pipe of Texas (SPOT) has If that’s the case, please make a big note on the plans — so we know to avoid that project. They actually are “prerequisites” — preliminary requirements to get any level of LEED certification. For the relatively small diameters, the gauges are sufficient to avoid collapse. However, space (height) restrictions may require flat oval ductwork to achieve the low-turbulence qualities of round ductwork.”. The majority of the products are produced from galvanized steel, but can be made of stainless steel, aluminum, or pvc coated steel. We just usually do it without letting our marketing people put leaves and butterflies on our literature and website. Started in 2000, we are a spiral and rectangular duct manufacturer located in Asheboro, NC. These lower pressure drops optimize the duct system performance and allow the transport of air at lower fan horsepower. Operating Temperature — up to 250°F Installed R-Value — R=4.2 for 1” spacing, R=8.4 for 2” spacing In a perfect world (at least for us) the LEED guideline would simply state “Use round and flat oval spiral ducts and fittings from Spiral Pipe of Texas — and here’s your points!” Unfortunately, it’s not that simple. Alternative Material – Armacell AP/Coilflex® elastomeric foam duct liner. 1″ x 1″ x 1/8″ angle ring reinforcing (12 foot maximum spacing) with 9 stitch welds 1.0″ long, A2 = min. Table 3 below shows the available sizes of spiral lockseam duct from Spiral Pipe of Texas and their area. Perhaps we should pause a moment to let these numbers sink in. Temperature Range — up to 350°F SPOT has additional literature giving more specific details for our architectural duct products. It should be noted that not all “die-stamped” or “pressed” elbows meet the minimum gauge requirements. 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. 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. Perhaps they can’t find them in their CAD libraries. There are many reliable spiral duct machine manufacturers, Artizono is one of them. Double-wall construction allows you to contain the insulation media between an inner and outer metal shell. Your duct’s going to cost a lot more – the cost of ductwork, both to buy/make it and to install it, has a direct correlation to weight. Part of the requirement involves the 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. Yes, many sheet metal contractors have their own shops and could — in theory — go out there and make the duct for your project right now. If you have installed double-wall spiral duct, you already know how to install this product. 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). info@impulseairspiral.com. Most installations will only need external bolted companion angle rings or our economical SPOT-Flanges. 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. Yet, it is the outer shell that determines gauge, reinforcing and construction, as well as defining how a duct fits within the physical constraints of a building. 4. Mill Phosphatized Steel (Paint Grip) Some material handling duct systems require seams and joints to “lap in direction of airflow”. Greater stiffness is inherent in their construction. So if you just haven’t been designing round and flat oval spiral duct because you couldn’t find the right symbols, give us a call. So, here we have a product — spiral duct — that uses less energy, less material and less labor than other methods of transporting air. These are guides for achieving progressive amounts of energy savings toward a net zero energy building and are available for different building types. You’re going to need more insulation – it’s going to take more square feet of insulation to cover the increased perimeter/surface area of rectangular duct. The following is our construction standard for positive pressures to +10” WG. Table 4 has nominal design weights for Vocational Woodworking Shop Dust Collection Systems using spiral lockseam duct. Black Iron, Standard Slip-Fit / Couplings Their recommendation for Ductwork Design and Construction is: “Low-energy use ductwork design involves short, direct and low pressure drop runs. 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. 1. Ductwork Made Easy US Duct, an American manufacturer of industrial ducts and industrial ductwork solutions, focuses on delivering quality products quickly and at the best price. Texas, have adopted state-wide energy codes. Other thicknesses available. Those sections would drop below the Minimum Transport Velocity and clogs would potentially form. Solid – standard metal liner in gauges and construction to contain the insulation and maintain concentricity and structural integrity. We all kind of know without trying it that putting a rectangular drain line downstream of your toilet would pretty much assure regular visits from the plumber. You know your cumulative exhaust flow rate (cubic feet per minute). Of course, a provocative response like that deserves some elaboration. Spiral lock-seams have practically no leakage, and are the only mechanical seams exempted from sealing under energy standards such as ASHRAE Standard 90.1-2013. The only mechanical seams that do not have to be sealed under this standard are the spiral lock seams of spiral duct. It has smooth interior for low friction loss with the grooved seam entirely on the outside. Round ducts have virtually no wall deflection in normal operating conditions, and the helical spiral seams strengthen the duct even more. Vocational Woodworking Shop Dust Collection Systems. We are Melbourne-based and offer a line of standard commercial and industrial spiral ducts, fittings,and custom fabrications designed to … But a system using spiral lockseam construction will typically use lighter-thickness materials, with diameter/thickness ratios of as much as 1800. Sheet metal ducts, and particularly spiral ducts, are proven to be durable in outdoor applications. If you really need the duct fast, there are dozens of places within a one-day shipping frame of your jobsite where you can find spiral round duct and fittings in stock for immediate shipment in the size range you should need on a fast-track project. 12. 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. 11. calls for ductwork to be constructed to Seal Class A. Diameters Available (i.d.) For our insulated products, our standard for double-wall products is Knauf Friendly-Feel Duct Wrap or an equivalent product. We, at, "GP Spira Duct Private Limited" (Hyderabad) are known as one of the most leading and prominent manufacturer and supplier of a very high quality range of spiral duct, mini duct, flat oval spiral duct, flexible duct and round duct… — 1” (6” to 90”Φ), 1 ½” (11” to 89”Φ), 2” (14” to 88”Φ) Standard 90.1–2013 “Energy Standard for Buildings Except Low-Rise Residential Buildings”. Within straight sections of trunk ducts, lateral branches with removable caps can be added. The recommended maximum leakage for a dust collection system is 2%. Keep in mind the chart above. There are quite a few options available for double-wall ducts, so it’s important that critical features are specified. Please contact your nearest representative for details. Note — metal spacers are not used to maintain concentricity between inner and outer shells. Woodworking shop dust collection systems are designed for all equipment hookups to be drawing their recommended exhaust flow rates at any time the system is operating. A1 = min. 2. Simply round that down to the next available duct size. Spiral-Mate But for some reason, we often see engineers leaving these symbols off of their drawings. This Duct Construction Guide combines those various requirements into a single reference. The round profile greater flow efficiencies than rectangular ducts. Second, anyone that’s ever seen a bad contractor snake a 25’-0” length of flex duct through an attic — and we really recommend that you don’t allow that — should understand the concept that a round duct can be maneuvered more readily than rectangular duct without compressing the area. contractor assembling our ducts using sealant, but our duct components themselves meet Seal Wood chips and sawdust would become embedded in the mastic, causing a chronic clogging issue. Sheet Metal Connectors, Inc. located in Minneapolis, Minnesota and Rockford, Illinois manufactures spiral pipe which is formed from a coil of metal into a rigid steel tube with a 4-ply spiral lockseam. Round is the most efficient shape for transporting air. 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). As obvious as it may be that you should have used round and flat oval duct, the contractor probably needs the rectangular work to pay for his shop and no one has the time to re-design the job and show how the duct system could have been much better. The length of the tapered body should be a minimum of 5 times the difference of the upstream and downstream diameters. Fitting construction – fully-welded or tack-welded and sealed. For round and flat oval spiral ducts, that Gauges – 28 to 16 for galvanized spiral lock-seam, 28 to 18 for stainless steel spiral lock-seams, 0.025” to 0.080” for aluminum spiral lock-seams, 22 gauge to 3/8” for welded longitudinal-seam duct. 3. You’re going to need a lot more duct sealant – even if you don’t test the duct to find that you’ve failed the energy code, you’re still required to construct the duct to Seal Class A. The one on the right denotes that a duct will be flat oval. Finally, there is a solution to your rooftop duct system needs that is the right shape, the right material and the right price. You should not try to effectively turn these branch fittings into 90-degree branches by combining the 30-degree lateral tap with a 60-degree elbow.
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