been “AMERICA’S SHEET METAL SOURCE”. 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. First of all, you have to seal the longitudinal seams of the rectangular duct. The seam on our galvanized sheet metal duct is formed on a snap-lock machine which allows ease of assembly on your job site. 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. At Spiral Pipe of Texas, we make products that meet or exceed the SMACNA HVAC Duct Construction Standards – Metal and Flexible (2005). 3 in. Rectangular and Round Duct Rectangular Duct Height (inches) Title: Duct Sizing Chart.xls sheet metal catalog. Light gauge angle rings, such as the SPOT Flange, are sufficient for these applications and can be welded to spiral lockseam pipe ends and van-stoned to fitting ends. Other types of cleanouts such as split sleeves and hinged access doors have been commonly used, but once opened, they are notoriously difficult to keep sealed. Some are as light as 25 gauge. There's a problem loading this menu right now. 12" 90 Deg. Black Iron, Standard Slip-Fit / Couplings Alternative Material – Armacell AP/Coilflex® elastomeric foam duct liner. Your performance is the same as for our other round duct products. Keep in mind the chart above. Angle Rings 3 foot lengths of Duct work for easy shipping and install. 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. 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. Pipe by Southwark Metal Mfg. For ducts 12” diameter and smaller, we recommend us-ing the MU Overcollars from METU-System. Master Flow Beaded Metal Pipe is available to help make your next HVAC project a success. For the larger primary trunk ducts, removing a section for cleanout is less desirable and practical. This guide is not intended to cover commercial and industrial woodworking facilities. It should be noted that not all “die-stamped” or “pressed” elbows meet the minimum gauge requirements. 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. ... 12-in x 60-in Galvanized Steel Round Duct Pipe. The round profile greater flow efficiencies than rectangular ducts. 4. But when you leave them off, you are usually going to end up with poor-performing and costly rectangular duct. 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. Flame spread/smoke developed index of 25/50 (ASTM E 84) and temperature use limit up to 180°F. And round and flat oval spiral duct are neither hard to find or noncompetitive. You might recognize the two symbols above. A round duct experiences only about 40% of the wind force a comparable rectangular duct would see. In woodshop collection systems, the additional sources of leakage are the slide blast gates and cleanouts. No painting required, will last years outdoors. Lengths of duct channel can be joined together using a male connector. Shop for Sheet Metal Duct Pipe & Fittings at Ferguson. After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in. The products and methods we recommend are chosen to meet the requirements in the most cost-effective way. Duct insulation is also critical in reducing HVAC system noise. Round pipe can be used as a main trunk line or branch line, as well as in return air situations. The rigidity of the phenolic board and the close tolerances of our annular construction eliminate the need for an inner coupling. 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). 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. Without spiral round duct, here are a few of the things that could happen. Best of all, you don’t have to pre-order all of your small diameter ducts cut-to-length. Because round ducts are inherently stronger than rectangular profiles, they can be lighter metal gauges and can be installed in longer spans. And with slip-joint construction you trim duct lengths of round and flat oval spiral ducts without compromising their integrity or performance. If your round air ducts run below the joists, lay one insulation batt on top of the duct. We can provide the metal shells as spiral duct or longitudinal seam welded duct, and in thicknesses from 10 gauge through 26 gauge. Our standard construction uses our spiral duct as the outer shell and a round metal longitudinal-seam duct for the inner shell. 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. Spiral round lock-seam duct is the most efficient way to transport air in HVAC systems. Most HVAC-grade fittings and assemblies use tack-welds, screws or rivets that are then sealed with mastics. Available in all materials offered above for outer shells. They create turbulence within the duct, leading to higher pressure drops and unpredictable transport velocity performance. However, space (height) restrictions may require flat oval ductwork to achieve the low-turbulence qualities of round ductwork.”. are based upon the outer shell, not the inner. Galvanised spiral metal, available in different sizes, and available in 1 meter and 2-meter lengths. 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. If their shop is not busy, their cost to make rectangular duct will be much higher. 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. We can even offer the product as flat oval or rectangular construction. 11. ... 6-in x 60-in Galvanized Steel Round Duct Pipe. Table 3 below shows the available sizes of spiral lockseam duct from Spiral Pipe of Texas and their area. Fitting construction – fully-welded or tack-welded and sealed. Thickness — standard 1” and 2” annular spacing. Tapered body transitions are required, and a maximum 30-degree branch angle is preferred. At Spiral Pipe of Texas, our home area of the Central and Southern US encompasses regions with high fluctuations in both temperature and humidity. The goal is a “friction fit”. As economies recovered, new and better buildings were incorporating ventilation and conditioning systems that had been developed during the previous few decades. The static pressure ranges may fall within those found in the SMACNA HVAC Duct Construction Standards. 9. It is machined to fill a 2” annular space in our double-wall construction, and our process eliminates all potential thermal gaps. Diameters Available (i.d.) Wonder Flange Standard 90.1–2013 “Energy Standard for Buildings Except Low-Rise Residential Buildings”. Table 4 has nominal design weights for Vocational Woodworking Shop Dust Collection Systems using spiral lockseam duct. Narrow Results By: ... 3-1/4" x 12" x 6", 30 Gauge, Hot Dip Galvanized Steel, Register, Rectangular to Round, Sheet Metal Duct End Boot. Each item of shop equipment has a recommended flow rate of exhaust air — either provided by the manufacturer or taken from a reference such as the ACGIH “Industrial Ventilation” (see Table x). 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. ASHRAE research projects prove better performance from round and flat oval ducts. 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. 12. That is the velocity that must be maintained from the shop equipment to the collector to avoid debris settling in the duct and potentially producing clogs. Class A. But there are many specialty duct systems that fall under lesser known standards and criteria. Rectangular and flat oval ducts would require heavier metal gauges and extensive reinforcement. The loss coefficients for these elbows is actually less than for segmented elbows with radii of 2.0 and 2.5, so you get better efficiency at a lesser cost. 2 820k return air 790 draw bands flex duct elbow 714 damper 090a angle round to oval boot 012 oval stackhead round duct ... 12" pipe 10" pipe 9" pipe length gauge item# 2' 24 140209 2' 26 130209 2' 28 120209 5' 24 140509 5' 26 130509 5' 28 120509 Elbow centerline radii should be a minimum of 2.0 with 2.5 recommended. This product has an R-value of 12.0. engineering info, submittal forms. There are quite a few options available for double-wall ducts, so it’s important that critical features are specified. 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. It has lower pressure drops, saving fan horsepower, and there is less heat gain/loss through the surface than with rectangular shapes. It’s usually not very pretty. Spiral Pipe Gauge We manufacture spiral pipe in 18, 20, 22, & 24 gauge galvanized metal. And this is truly a round duct, not an 8 or 12-sided adaptation from rectangular duct. Round and flat oval spiral duct is expected to leak only 75% of the allowance. These flanges can be connected with self-tapping sheet metal screws be-cause such screws will not penetrate the airstream. So, it’s no surprise that most estimators predict installation rates of 50% more pounds per man-hour installed for spiral round duct than for rectangular duct. Longer hanger spacing can be used if the duct joints are flanged and guidelines found in the SMACNA Round Industrial Duct Construction Standards are followed (sections 4.10 and 5.8). We can factory-assemble manifolds of duct and fittings to minimize field work. Flexible ducts are commonly used for final connection to shop equipment. Most vocational woodworking shop dust collectors operate in the range of -6 to -15” WG. 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. 1″ x 1″ x 1/8″ angle ring reinforcing (12 foot maximum spacing) with 9 stitch welds 1.5″ long. The recommended maximum leakage for a dust collection system is 2%. x 5 ft. Other rooftop products have been introduced, including some made with phenolic board. Model #GV0436-A. The insulation is protected from external damage — a critical concern for ductwork on rooftops and out of the building envelope. The result is PhenoliDuct. Maximum Air Velocity (ASTM C1071) — 6000 fpm Table saws, lathes, joiners and planers produce larger chips. A lot of money — and limitations — get added to shop dust collectors through the overuse of proprietary duct assembly systems. So, spiral duct is a “green” product made from “green” materials. 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. We make diameters ranging from 3” to 92” and metal thicknesses from 26 gauge to 16 gauge. Round duct is preferred over rectangular duct. 7. Woodworking equipment generally pro-duces two types of debris. This is intended to reduce particulate buildup when transporting long fibers that could snag on exposed metal ends. Appearance and finish – standard factory finish (no special cleaning, welds spray-painted, mill markings, labels and piece-marks visible), paint-ready (welds not painted, removeable labels), and factory painted. The more separation, the better. The particulate transported — sawdust and small wood chips — does not cause much impact damage or abrasion. As a result, spiral duct systems usually weigh 30% less than equivalent rectangular duct systems — less material! Working with round ductwork. 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). Density — 4.0 pcf Continuously welded seam fittings are available if specified. Rectangular connections and openings should be avoided because of their tendency for corner leakage. for pricing and availability. wait in line. These are guides for achieving progressive amounts of energy savings toward a net zero energy building and are available for different building types. After the liner is assembled into the outer metal shell, SPOT provides the finishing touches by using JM’s SuperSeal® coating product to dress up any exposed edges, as well as utilizing mechanical fasteners as needed to assure the liner stays permanently affixed. By anyone’s definition, this is an inherently “green” product. Corporate Headquarters. Bob’s been a tin bender for more than 40 years. Master Flow® Round Metal Duct Pipes are available in a variety of common lengths, diameters, and gauges to help you make your next HVAC project a … The only mechanical seams that do not have to be sealed under this standard are the spiral lock seams of spiral duct. 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. 12-14 inch (48) 15-17 inch (7) 18-20 inch (10) 21-23 inch (4) 24-26 inch (4) Smaller than 3 inch (36) Shape. These lower pressure drops optimize the duct system performance and allow the transport of air at lower fan horsepower. (8" Round Duct, Duct- Tee Assembly), Single Wall Stainless Steel Pre-Engineered Grease Duct- Used for the removal of smoke and grease-laden vapors. 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. 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. Most commercial duct projects go through months of coordination and detailing, so getting any duct — regardless of what you think shop lead time is — is a matter of planning, not “availability”. 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. 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. That by itself should give you an expectation of twice the leakage. 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. Reduce field labor, as well as giving consistency and product features won’t... No wall deflection in positive and low pressures dimensions and … this product can not be shipped via parcel. 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