The particulate transported — sawdust and small wood chips — does not cause much impact damage or abrasion. Table 4 has nominal design weights for Vocational Woodworking Shop Dust Collection Systems using spiral lockseam duct. 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. Tapered body transitions are required, and a maximum 30-degree branch angle is preferred. The product is ideally suited for systems with long, straight runs of duct — gymnasiums, cafeterias, airports, sports arenas and convention centers. Flame spread/smoke developed index of 25/50 (ASTM E 84) and temperature use limit up to 180°F. 12. And with slip-joint construction you trim duct lengths of round and flat oval spiral ducts without compromising their integrity or performance. We have combined our almost 40 years of quality metal duct fabrication with a willingness to innovate and explore new technologies. Simple aluminum cast-body gates are not expensive and have a thumb-screw for locking them in place. 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. Like our double-wall products, the outer metal shell is the basis of construction. But there are many specialty duct systems that fall under lesser known standards and criteria. Continuously welded seam fittings are available if specified. However, space (height) restrictions may require flat oval ductwork to achieve the low-turbulence qualities of round ductwork.”. . Kevin Sykes First, many of the “green” features of our products are not even things you can get LEED credits for. 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. 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. Which brings us to the question of “LEED”. But for some reason, we often see engineers leaving these symbols off of their drawings. All PCD and SPOT Agion fittings are riveted and sealed. Fittings have male ends with a slightly smaller diameter to press-fit into duct.. Galvanized steel has good corrosion resistance. GREENGUARD Gold Certified. When you do that, you’ll get a pretty good picture of why rectangular duct leaks at least twice as much as spiral duct. Most installations will only need external bolted companion angle rings or our economical SPOT-Flanges. Double-wall construction allows you to contain the insulation media between an inner and outer metal shell. Standard Material – our standard product is a 0.75# density Knauf AtmosphereTM Duct Wrap with ECOSE® Technology. For ducts 12” diameter and smaller, we recommend us-ing the MU Overcollars from METU-System. Available in all materials offered above for outer shells. 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. Countless real-world examples where a contractor or manufacturer converted a mostly rectangular duct design to round and flat oval spiral duct, have proven you can get better performance at a better installed cost. For all of the above reasons, the minimum gauge used for a vocational woodworking shop dust collection system duct is 22 gauge. 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. The goal is a “friction fit”. The removable caps are fixed in place with an MU Overcollar, so they can be easily removed with a single bolt. And we take duct leakage seriously, because it’s considered to be the single largest preventable energy waste in commercial and residential buildings — even more of a waste than leaving lights and A/C on when the building is unoccupied. 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. For suspension and support, the weight of dust collection duct is calculated as the weight of the duct itself, plus the weight of the sawdust filling half the duct. The flexible duct should be a non-collapsible hose, rated for the pressure and for the intended use. The following are potential sources for LEED credit: So, we hope this answers the question “Are Your Products Green?” Spiral Pipe of Texas is proud to make products that are “green” throughout their history and origin, in their manufacture, and through their use. Use order templates for: Complete Systems; Truck Stock; Warehouse Inventory; Tools & Supplies are based upon the outer shell, not the inner. Fitting construction – fully-welded or tack-welded and sealed. wait in line. Most of the time, for a typical HVAC system, they indicate you want spiral duct. Simply round that down to the next available duct size. Weight-based labor formulas generally allow 50% more pounds per man-hour for installing round and flat oval spiral duct versus rectangular. And it’s pretty easy for you to confirm after a couple of moments on your Ductulator. Angle Rings Your performance is the same as for our other round duct products. So, here we have a product — spiral duct — that uses less energy, less material and less labor than other methods of transporting air. They should be spaced a maximum 12 feet apart for ducts 12” diameter and smaller, and maximum 20 feet apart for larger diameters. Any upstream reductions are made by putting a reducer on the upstream end. support spacing is 12’-0”. No, availability is not an issue. Owners and designers want a product that will not wick or retain moisture. and published articles. They are most commonly used in conjunction with floor sweeps and shop cleanup. First of all, flat oval duct is going to work anywhere rectangular would, but without the pressure drops, noise, leakage and weight. As a result, spiral duct systems usually weigh 30% less than equivalent rectangular duct systems — less material! Spiral duct has always been green — long before the term came into being. Debris will settle out where both the tap and reducer meet the barrel, potentially causing clogs. Labor needed for transverse joint assembly can also be reduced since a single slip joint is all that is necessary. 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. Here are some of the product options for round insulated duct that are available from Spiral Pipe of Texas. For HVAC air ducts, the outer shell is the structural and pressure containment portion of the product, and is the basis of construction. Where possible, we recommend the use of these die-formed elbows with a centerline radius of 1.5. 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. That by itself should give you an expectation of twice the leakage. Length should be limited to the expected movement. Spiral-Mate Those sections would drop below the Minimum Transport Velocity and clogs would potentially form. To go further, ASHRAE is producing a series of Advanced Energy Design Guides for commercial construction. These are guides for achieving progressive amounts of energy savings toward a net zero energy building and are available for different building types. It should be noted that not all “die-stamped” or “pressed” elbows meet the minimum gauge requirements. The one on the left is used to denote that a duct will be round. Most are simply one or two layers of insulating board with an external lagging applied. Special materials and connectors may be available. They create turbulence within the duct, leading to higher pressure drops and unpredictable transport velocity performance. The ducts used in vocational woodshop dust collection systems may outwardly appear to be the same spiral lockseam duct and fittings used for HVAC applications. Round and flat oval spiral duct is expected to leak only 75% of the allowance. This is a cost-saving measure. 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. 11. We are Melbourne-based and offer a line of standard commercial and industrial spiral ducts, fittings,and custom fabrications designed to … 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). This facility is a fully equipped plant of approximately 44,000 square feet, with duplicate backup machinery for all major manufacturing processes. Keep in mind the chart above. We offer spiral lockseam construction, tack-welded and sealed construction, MIG and TIG welding. This does not mean you can’t get “LEED points” for using spiral duct and fittings. Dust collection ducts are recommended to be round in shape. The Advanced Energy Design Guides were written by your fellow engineers, not a trade organization or some contractor that bought a coil line and needs to get the most use from it. We manufacture spiral pipe and fittings in single-wall, double-wall, or internally lined. No painting required, will last years outdoors. Elbows and bends should be a minimum of two gauges heavier than the straight ducts of the same size used in a system. 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. Recommended cap size is trunk diameter – 2” for branches from the main, up to a maximum 12” diameter cap size. The result is 50% more R-value at 20-50% less cost. The most cost-effective method for producing a good cleanout is through the use of removable caps. 6. But they had three problems — energy was expensive, raw materials were also expensive and often in short supply, and there was a Please contact your nearest representative for details. And with airflow, that gives you two unwanted problems that are directly related to turbulence – higher pressure drops and increased noise. 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. For aspect ratios 2:1 to 4:1 — pretty typical for rectangular ducts — the perimeter relative to an equivalent round diameter is 30 to 55% (2013 ASHRAE Handbook – Fundamentals, Chapter 21 “Duct Design”, page 12, about midway down the right side of the page). Started in 2000, we are a spiral and rectangular duct manufacturer located in Asheboro, NC. This greatly out-performs other insulations that struggle — and often fail — to reach the minimum 25/50 indices required by most codes. Spiral Pipe … 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. Fiber-free, non-particulating foam alternative to glass fiber insulations. You should have a little bit of metal scraping when you insert a slip fitting into a section of spiral duct. Rooftop duct should always be round when possible. Houston, Texas 77029 Phone: (713)678-8471 Fax: (713)672-0509 Toll-Free (877)774-DUCT (3828) We can factory-assemble manifolds of duct and fittings to minimize field work. Things just don’t flow as well when you have square corners. 9. Download and view our Catalogues, 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. And we are happy to provide it. Most HVAC-grade fittings and assemblies use tack-welds, screws or rivets that are then sealed with mastics. We’re not making this up! They are very economical and make joint assembly fast. Our Roof Curb fabrication design enables the fastest lead times in the industry for Roof Curb and Equipment Rail manufacturing. Copyright © document.write(new Date().getFullYear());2015 Spiral Pipe of Texas. They should be located in the vertical duct riser from the shop equipment, approximately 42” above the floor for ease of access, and five diameters away from elbows. Rectangular and flat oval ducts would require heavier metal gauges and extensive reinforcement. The problem with this type of fitting is that Minimum Transport Velocity is not maintained. You know your cumulative exhaust flow rate (cubic feet per minute). For 90-degree directional changes in the trunks, removable caps can be utilized by having either heel-tapped elbows or using a lateral branch + elbow for the primary flow (for 12” and smaller). Elbow centerline radii should be a minimum of 2.0 with 2.5 recommended. 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. Perforated metal – standard material is a 23% open area pattern with 3/32” holes on 3/16” centers, staggered. To solve all three problems, spiral ducts were developed. Greater stiffness is inherent in their construction. 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. Operating Temperature — up to 250°F 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.
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