Our term for this is “green-washing”. Thickness — standard 1” and 2” annular spacing. Part #: SHMRAB12128O. This guide is not intended to cover commercial and industrial woodworking facilities. The problem with this type of fitting is that Minimum Transport Velocity is not maintained. Maximum Air Velocity (ASTM C1071) — 6000 fpm Most vocational woodworking shop dust collectors operate in the range of -6 to -15” WG. Texas, have adopted state-wide energy codes. The result is 50% more R-value at 20-50% less cost. The rectangular dimensions and … It will not perform as well, it will probably cost more, and you will have done the owner no favors. Browse pipes and metal ducts with different angles to change the direction of air, depending on home layouts or local codes. 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. 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. In the real world, they try to keep their shops busy and your job will Shop imperial 12-in x 60-in galvanized steel round duct pipe in the duct pipe section of Lowes.com Most HVAC-grade fittings and assemblies use tack-welds, screws or rivets that are then sealed with mastics. Woodshop dust collection systems use “tapered body” branch fittings. Direct your helper to hold a second batt up to the underside of the duct. It should be noted that not all “die-stamped” or “pressed” elbows meet the minimum gauge requirements. The branch fittings in the trunk duct should be located on the collector side from the woodshop equipment, on a straight line from the elbow turning vertically down to the equipment. It does not contain phenol, formaldehyde, acrylics or artificial colors. And with slip-joint construction you trim duct lengths of round and flat oval spiral ducts without compromising their integrity or performance. Round pipe provides the best metal-to-airflow ratio. We have already mentioned a removable cap for the last branch of the trunk ducts. Dimensions: 12"x60" Shipping Dimensions: 60.12 H x 12.50 W x 12.50 D. Shipping Weight: 12.5 lbs. 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 our insulated products, our standard for double-wall products is Knauf Friendly-Feel Duct Wrap or an equivalent product. Show List View $ Royal Metal Products 8 x 4 x 4 in. Deliver more air with less static pressure buildup with round pipe. 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”. Your Round Solution for Rooftop HVAC Duct Systems. 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). 12" 90 Deg. In actual practice, insulation compression is more of a concern for larger diameters of duct where double-wall flanges are typically used for transverse connectors, eliminating any need for spacers. The only mechanical seams that do not have to be sealed under this standard are the spiral lock seams of spiral duct. They actually are “prerequisites” — preliminary requirements to get any level of LEED certification. It carries a GREENGUARD Gold Certification. Hanger and support spacings are greater for round ducts. One end of each piece is crimped for easy fitting of consecutive joints or to sheet metal fittings and flexible duct. Density — 4.0 pcf Most HVAC ducts need to be insulated. Other rooftop products have been introduced, including some made with phenolic board. 3003 Aluminum One end of each piece is crimped for easy fitting of consecutive joints or to sheet metal fittings and flexible duct. 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. This product cannot be shipped via a parcel service due to product dimensions. This Duct Construction Guide combines those various requirements into a single reference. 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. Product Guides It also helps to use efficient fittings, and we will go over them below. Simply round that down to the next available duct size. of joint sealingTotal = 3,912 lineal inches of longitudinal and joint sealing. 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. Galvanised spiral metal, available in different sizes, and available in 1 meter and 2-meter lengths. We can even offer the product as flat oval or rectangular construction. Perhaps we should pause a moment to let these numbers sink in. The round profile greater flow efficiencies than rectangular ducts. These have neither the strength nor durability of double-wall metal construction. The goal is a “friction fit”. 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. Note — metal spacers are not used to maintain concentricity between inner and outer shells. We are limiting customer service interactions to PHONE and EMAIL ONLY however our offices are closed to in-person visits. of longitudinal joint sealing100 feet / 56 in/section = 21.43 sections = 21 joints21 joints x 72 perimeter inches = 1,512 lin.in. 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. 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. Approximately 70% of all steel and 30% of all zinc consumed are made of recycled material. Each box of metal duct contains five 5-ft. sections, for a total of 25 ft. Shop Grainger for self-sealing duct and fittings and all your HVAC supplies! When you do that, you’ll get a pretty good picture of why rectangular duct leaks at least twice as much as spiral duct. Ducts can be suspended using appropriatelysized cable hangers, teardrop strap hangers or saddles. We aren’t spending time and money trying to overcome properties that don’t lend themselves to the application. Heating & Cooling Products 12" x 60" 26 Gauge Round Metal Duct Pipe. Sort. Flange Insert Box with Gasket ... 12 x 12 x 8 in. Made with EPA registered Microban® antimicrobial product protection. A stop bead runs around the middle of the coupling to center the coupling in the connection. Table 4 has nominal design weights for Vocational Woodworking Shop Dust Collection Systems using spiral lockseam duct. And this is truly a round duct, not an 8 or 12-sided adaptation from rectangular duct. Table saws, lathes, joiners and planers produce larger chips. They are generally not used for balancing the system or shutting off unused equipment. Flame spread/smoke developed index of 25/50 (ASTM E 84) and temperature use limit up to 180°F. These lower pressure drops optimize the duct system performance and allow the transport of air at lower fan horsepower. Leadership in Energy and Environmental Design (LEED) is one of the most popular green building certification programs used worldwide. Alibaba.com offers 1,371 12 duct pipe products. Compact dryer connectors allow you to place the appliance close to the wall without bending the pipe … Secure the connection by installing sheet metal screws through the outer shell of the duct, 1/2 inch from the stop bead. The exhaust flow rates of the floor sweeps are not usually included in the total system volume. ASHRAE research projects prove better performance from round and flat oval ducts. And within the rectangular joint, the biggest culprits are those pesky corners — the same ones that cause the turbulence that gives rectangular duct it’s higher pressure drops and increased noise. Standard Material – our standard product is a 0.75# density Knauf AtmosphereTM Duct Wrap with ECOSE® Technology. A lot of money — and limitations — get added to shop dust collectors through the overuse of proprietary duct assembly systems. Most engineers and contractors that work with educational facilities are familiar with standard HVAC design practices and SMACNA duct construction standards. They have been proven to have almost no inherent leakage. Elbow Round Duct Fitting, 24 ga. 12" Round Ceiling Diffuser - Easy Air Flow - HVAC Duct [White] [16" Outer Dimensions]. The numbers stack up overwhelmingly in favor of round and flat oval spiral ducts. So, it’s no surprise that we have been at the forefront of developing and implementing insulated duct products. In woodshop collection systems, the additional sources of leakage are the slide blast gates and cleanouts. Your performance is the same as for our other round duct products. 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. But a system using spiral lockseam construction will typically use lighter-thickness materials, with diameter/thickness ratios of as much as 1800. They are very economical and make joint assembly fast. For the relatively small diameters, the gauges are sufficient to avoid collapse. Length should be limited to the expected movement. 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. And ASHRAE has worked extensively to help its’ members achieve these goals by compiling research and assembling cost feedback that might be impractical for a single engineering firm to do. However, the actual requirements for a duct system in this application are higher and involve other standards. This product has an R-value of 12.0. Whether dealing with how much an assembled length of duct deflects (hanger spacing and seismic bracing) or how much the walls of a duct deflect (limiting metal fatigue, low-frequency noise generation and how the duct may impede other items within the building), the goal is to keep a duct system as static and motionless as possible. 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. Download and view our Catalogues, Most of the time, for a typical HVAC system, they indicate you want spiral duct. The fittings and flange attachments need to be fully-welded construction. It doesn’t say you have to test it, but you are expected to meet the same standards as the duct you are required to test. 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. 12" x 8" Round Reducer Duct Fitting, 26 ga. C-Box HVAC Plenum Ceiling Box 12 x 12 x 8 Round, Duct Outlet 12" x 12" Ceiling Box, w/ 10" Round Collar - Connects Register Vent and Diffuser HVAC, Saba Air Vent Cover Grille - Acrylic Plexiglass 10" Round Duct Opening (12" Round Overall) White Finish Decorative Register Covers for Walls and Ceilings NOT for Floor USE, Charlotte (1PCs). HVAC Duct great for DIY projects. And it’s pretty easy for you to confirm after a couple of moments on your Ductulator. Class A. Available Insulation Thicknesses — 1”, 1 ½” and 2” 3 in. Their recommendation for Ductwork Design and Construction is: “Low-energy use ductwork design involves short, direct and low pressure drop runs. 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. When making a selection below to narrow your results down, each selection made will reload the page to display the desired results. 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. The duct won’t be easier or faster to get – this one really doesn’t make sense for commercial construction, yet we hear it all the time. No on-site welding required. The result is PhenoliDuct. 3-1/4" x 12" x 6", Hot Dip Galvanized Steel, 90D, Rectangular to Round, Stack, Sheet Metal Duct … For ducts 12” diameter and smaller, we recommend us-ing the MU Overcollars from METU-System. This is a cost-saving measure. x 5 ft. Beaded Round Metal Duct Pipe Description. 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. Long Seam Weld Flange. Available in all materials offered above for outer shells. First of all, you have to seal the longitudinal seams of the rectangular duct. It is an important first step in promoting “green” construction in commercial buildings. Elbow Round Duct Fitting, 26 ga. C-Box HVAC Plenum Ceiling Box 12 x 12 x 12 Round-Connects to Vent Register Diffuser, Square to Round Transition Box 12x12 inch Square & 6 inch Round, 12" BUTTERFLY DAMPER - Control Your Airflow on drop ceiling grilles of 24x24 (12" round duct opening), 12"w X 10"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 13.75"w X 11.75"h], Master Flow 12 in. However, space (height) restrictions may require flat oval duct to achieve the low turbulence qualities of round ductwork.”. Let’s look further at some of the If a joint is designed for disassembly, pre-punched angle rings can be used, and the flanges bolted together. The table below can be used to compare equivalent diameters for rectangular and round circular ducts. The connection of the sheet metal pipe is crimped for easy fitting of consecutive duct joints or to sheet metal fittings and Flexible duct. These flanges can be connected with self-tapping sheet metal screws be-cause such screws will not penetrate the airstream. A wide variety of 12 duct pipe options are available to you, such as project solution capability, design style, … However, prefabricated elbows of “smooth construction” can be used. You’re going to need more hangers/supports – about 50% more. 7. POINTS. You won’t follow the ASHRAE Advanced Energy Design Guides – it’s a big deal to try and reduce energy use in commercial buildings by 30% and 50%. Standard 1” thickness (larger annular thicknesses obtained by wrapping successive layers) with R-value R=4.2. And this is truly a round duct, not an 8 or 12-sided adaptation from rectangular duct. 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). It is machined to fill a 2” annular space in our double-wall construction, and our process eliminates all potential thermal gaps. The main trunks of dust collection systems are relatively straight runs in predictable and fixed positions. 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. Choose from our selection of round duct, including standard duct and fittings, quick-disconnect duct and fittings, and more. We just usually do it without letting our marketing people put leaves and butterflies on our literature and website. You should have a little bit of metal scraping when you insert a slip fitting into a section of spiral duct. First, many of the “green” features of our products are not even things you can get LEED credits for. Round/curved surfaces have little-to-no deflection in positive and low pressures. Hard Sheet Metal Ductwork. Use insulated duct or duct board in unheated spaces. To go further, ASHRAE is producing a series of Advanced Energy Design Guides for commercial construction. Those sections would drop below the Minimum Transport Velocity and clogs would potentially form. 12" Snap Lock KD Galvanized Metal Duct. Galvanealed Steel — A60f Diameters Available (i.d.) Craig Company, Inc. catalog including Spiral Pipe,Snap-Lock Pipe,Round End Caps,Pipe Couplings - Male/Male,Ductwork Take-Off Fittings,Concentric … Owners and designers want a product that will not wick or retain moisture. Part of the requirement involves the Debris will settle out where both the tap and reducer meet the barrel, potentially causing clogs. But they had three problems — energy was expensive, raw materials were also expensive and often in short supply, and there was a 12" x 6" Round Reducer Duct Fitting, 26 ga. 12" Circular Round Aluminum HVAC Supply Grille Air Diffuser - with Butterfly Damper - Vent Duct Cover [Outer Dimensions: 14"], Broan-NuTone T81212 12" Round Duct Transition In-Line Adapters, Duct Outlet 14" x 14" Ceiling Box, w/ 12" Round Collar - Connects Register Vent and Diffuser HVAC, Speedi-Products FDSC-12 12-Inch Diameter Flex and Sheet Metal Duct Splice Connector Collar, Duct Outlet 12" x 12" Ceiling Box, w/ 8" Round Collar - Connects Register Vent and Diffuser HVAC, HBW 8" Round Ceiling Diffuser White Powder Coated with Outside Dimension of 12" Fitting in 8" Duct. And with airflow, that gives you two unwanted problems that are directly related to turbulence – higher pressure drops and increased noise. calls for ductwork to be constructed to Seal Class A. Round Metal Ducting. Elbows and bends should be a minimum of two gauges heavier than the straight ducts of the same size used in a system. Flat surfaces deflect. It lists the references used here, and most have greatly expanded ranges of size and capacity that can be used for those applications. Like our double-wall products, the outer metal shell is the basis of construction. Duct insulation is also critical in reducing HVAC system noise. engineering info, submittal forms. The insulation is thicker than the intended annular space between metal shells (1.5” thick for 1” nominal spacing) so that net density is after fabrication is approximately 1.00#. Round pipe can be used as a main trunk line or branch line, as well as in return air situations. Tapered body transitions are required, and a maximum 30-degree branch angle is preferred. We can factory-assemble manifolds of duct and fittings to minimize field work. We can provide desirable characteristics such as fully-welded fittings without worrying about setting the insulation on fire. This fits your . As with any duct system, a substantial portion of the leakage occurs at the duct joints. Fantech CKR10-12 - 10" to 12" Round Metal Duct Reducer - 10" to 12" Round Metal Duct Reducer

Round, concentric, galvanized metal duct … 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. 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. If you wish to purchase in bulk please contact us at 813-885-7999 for a freight quote. Actually, it’s even easier to install than our fiberglass insulated products. If your round air ducts run below the joists, lay one insulation batt on top of the duct. Our standard construction uses our spiral duct as the outer shell and a round metal longitudinal-seam duct for the inner shell. Duct Outlet 14" x 14" Ceiling Box, w/ 12" Round Collar - Connects Register Vent a… They specifically state “Round duct is preferred over rectangular duct. Prime members enjoy FREE Delivery and exclusive access to music, movies, TV shows, original audio series, and Kindle books. The seam on our galvanized sheet metal duct is formed on a snap-lock machine which … Because round ducts are inherently stronger than rectangular profiles, they can be lighter metal gauges and can be installed in longer spans. Do you see where we’re going with all this? Eastern Sheet Metal SINGLE-WALL ROUND SPIRAL DUCT AND FITTINGS CONSTRUCTION STANDARDS Positive Pressure Gauge selection for galvanized steel (ASTM A 653), paint grip steel, type 304 and 316 stainless steel, ... 84”22C 12 2012 C20 E12 18 E12 18 12 F16 F12 90”22D12 18 12 D18 E12 16 E12 18 12 G16 G12 96”22E12 18 12 E18 E12 16 E12 18 12 … They also have less-efficient airflows and corners where particulate can be trapped. Duct Square-To-Round. 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. 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. 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. Rooftop duct should always be round when possible. Surface Burning Characteristics — Flame Spread 25 and Smoke Developed 50 (tested in accordance with UL 723, ASTM E 84 and NFPA 255) The spiral duct industry started in Northern Europe at the end of World War II. Dust collection ducts are recommended to be round in shape. 12" 90 Deg. Our customers can also perform field-modifications to the duct without creating a fire hazard. 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. Rectangular duct meeting the required Seal Class A is expected to leak 50% more than the allowance. And at the end of service, virtually 100% of galvanized steel ductwork can be recycled. 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. They are most commonly used in conjunction with floor sweeps and shop cleanup. 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