SPOT is taking all precautions during the COVID-19 coronavirus pandemic. The function of the inner shell is to contain the insulation liner material and maintain the cross-sectional profile of the airstream. The new ASHRAE energy codes are the culmination of years of study and debate to address something we’ve known for years — duct systems leak too much and it’s been costing billions of dollars. We do remain OPEN FOR BUSINESS and stand ready to serve you. The differences between rectangular weight and spiral flat oval weight can be substantial in the “low pressure” range, but things start to even out in flat oval’s favor as the pressure class increases. Success Stories 6.3 ft 2 duct per l.f. of duct. Spiral lockseams have negligible leakage (various tests carried out in accordance with AMCA 511) which have earned them their sealing exemption in ASHRAE Standard 90.1. Choosing the right duct options to meet these new standards can have little or no net impact on cost. Description. Our wide selection of grilles, registers, diffusers, and accessories includes a variety of shapes and sizes to meet any application and budget requirement. My duct vent was 7" and this came with a 4-inch duct adaptor. Double-wall insulated flat oval ducts can be made in lengths up to 20’-0”, but we recommend that ducts in exposed applications be limited to 8’-0” in length so they can be shipped “standing up” to minimize damage to the appearance. And the maximum permitted duct leakage is “Class 4” — 4 CFM per 100 ft2 of duct surface at 1” WG. The unit itself is surprisingly light (feels almost cheap to hold). So the choice should be clear. For ducts suspended above an acoustic ceiling to meet a design RC of 35, the recommended maximum velocity for rectangular duct is 1750 FPM versus 3000 FPM for round and flat oval (2015 ASHRAE Handbook – HVAC Applications Chapter 48). WG or more” is that static pressure determines how much deflection a duct surface will have. Spiral Flat oval duct can be used for negative pressure, especially long runs of return air at low pressures, but that is an area not currently covered in the SMACNA standards. The F2 Grease Duct Sandwich Access Door is for grease duct applications and meets NFPA 96 standards. Spiral flat oval duct is usually provided in 8’ to 10’ lengths, and can be made up to 20’ long. They greatly increase field installation productivity while reducing deflection in both the inner and outer shells. As an alternative “fiber-free” insulation, we also offer Armacell AP/Coilflex® elastomeric foam insulation in 1” and 2” thicknesses. All ducts — even low pressure ducts — must be sealed to Class A. And no one contests that round spiral duct is less expensive and more efficient than rectangular duct. Did you know that a flat oval duct has less “square-feet-per-lineal-feet” than an equivalent rectangular duct? Yes, higher velocities result in higher pressure drops, even with round and flat oval ducts. Since then, we have grown from a local spiral pipe and fitting supplier to a nationally recognized, leading manufacturer of labor saving duct systems and sheet metal components. But more significantly, they usually have less than half as many duct joints as rectangular duct (10’ or greater lengths versus 56” lengths). The ECCODUCT™ system is a rectangular spiral seamed duct embedded in the structural concrete floors of high-rise buildings. In the end, an estimated cost to the owner of $1.75/CFM/year for duct system leakage — regardless of where in the system it was happening — makes the payback for better systems worthwhile. Stainless and galvanized pipe keeps work environments clean and safe. But overall, the fittings are more efficient already. A flat oval duct system is not all flat oval. Only 4 screws were required to mount. And those branch fittings are usually round fittings — efficient round taps manifolded to the flat oval trunks. Probably, but not without buckets of sealant and practices far beyond what most engineers and contractors are used to. Round and flat oval ducts have higher dynamic efficiency, lower noise, less leakage, and lower heat gain (less surface area, higher velocities for the same air mass). Local: 763-572-0000. Standard construction and gauges are in accordance with SMACNA standards for +10” WG. Do you have a version of the venerable “Trane Ductulator”? As much as half of a medium pressure duct system designed as rectangular duct should be round — and installed round duct is less expensive than installed rectangular duct (even double-wall round versus lined rectangular duct). Fittings can be made with either fully-welded construction or “tack-welded-and-sealed” construction. The outer metal shell is the basis of construction, designed to contain the air at the specified pressure. What began as a small, regional business in a tiny office and warehouse space in Columbus, Ohio has … engineering info, submittal forms. They can be ordered without corrugations by request. We recommend that for flat oval ducts with sufficient flat span to exhibit “sagging”, that flanged transverse connectors be used. But don’t assume the cost of flat oval fittings are exorbitant compared to rectangular fittings, because it’s not the case. In comparing a simple duct system — 40’ of straight duct, a 90-degree elbow, a transition and three installed taps — it suggested that the installed rectangular duct section ($775 to $1375) was less expensive than the installed flat oval duct section ($975 to $2100). However, space (height) restrictions may require flat oval ductwork to achieve the low-turbulence qualities of round ductwork.” That is the wording in your ASHRAE Advanced Energy Design Guides. And for external wrapping, that old advantage for insulating rectangular versus flat oval not only goes away, it actually favors flat oval. Spiral galvanized pipe is carefully engineered and built to meet or exceed all SMACNA standards (Sheet Metal And Contractors National Association). Double-wall flat oval duct used to be compared to lined rectangular duct without an internal metal shell. centers (if you have 4 holes, you may consider purchasing a soap dispenser either at the store or online at homedepot.com) As soon as those restrictions are satisfied — and generally for all branch runouts — the duct should be designed as round. This glass mineral wool product is purchased in thicknesses 50% greater than the intended annular space, the compressed to approximately 1.0 PCF density. A flat oval duct system sealed to Class A is expected to leak 2 CFM/100 ft.2 of duct surface area. The SMACNA manual has gauge-deflection charts for seven different pressure classifications for rectangular duct — ½”, 1”, 2”, 3”, 4”, 6” and 10” WG. It is a practical and common sense approach to sustainable construction and to meet the net energy usage goals of ASHRAE and the industry. When you get into the economics of this change it makes a lot of sense. That manual is an excellent structural guide for building ducts and follows a simple premise — what is the minimum metal thickness and reinforcing to limit wall deflection to a specific amount? But a lot more than just the “cost” has changed in the last 25 years. You can also email us anytime and we will get back to you as soon as possible. PVC-coated steel combines the strength of steel with the corrosion resistance of plastic. The high-temperature-resistant rubber inside ensures the connection is leaking free. We lead the HVAC industry in innovation and hold many patents. The inner metal shell holds the insulation material in place and assures a smooth airstream. The outer metal shell of straight duct may be spiral flat oval lock-seam duct or longitudinal-seam welded duct. The new codes have eliminated some faulty practices that have existed for decades. Access tools and software to simplify indoor climate solutions Rectangular double-wall duct is more expensive than round or flat oval double-wall duct. Available widths of 15” to 129”. Let’s take a look at a few of the facts about these modern duct systems. As control panels grow increasingly complex and crowded, schedules get tighter and budgets shrink, more and more system integrators and engineers are realizing the advantages of IBOCO's innovative wire management system. Black duct is used in the data communication, patch panel, fiber cable and telecommunication industries. Can rectangular duct be sealed enough to meet this new standard? One 2005 study conservatively estimated duct leakage cost as $2.9B per year. been “AMERICA’S SHEET METAL SOURCE”. High Efficiency Take Off (Super Heto) with 2-inch Extension and EZ Flange, E-Z Flange with Barrel Clamp – 26 to 96-inch Diameter, PBN – Parallel Blade Non-Sealed Balancing Damper. This is where you can really start to save money. Sheet Metal Connectors, Inc. (SMC) TDC, Slip/Drive and Raw Sheet Metal Connectors, Inc. rectangular duct and fittings are one part of our complete line of HVAC products. [...], “High performance” has reached buzzword status in the HVAC industry. If yours is a commercial HVAC project, you probably answered yes to most, if not all, of the above statements. We want to be your source for flat oval ducts and fittings. Unsealed duct at ½” static pressure. Unless specifically ordered, standard construction is to tack-weld all seams except the spiral lock-seams, and omit sealing. We’ll be happy to show you our own comparisons as well as published comparisons from SPIDA and some of our competitors. General e-mail support: (function(){var ml="%omc4stdpru.0",mi="5:8819604<5237:36;312",o="";for(var j=0,l=mi.length;j
Learn More, Sheet Metal Connectors, Inc. looks back on history, future for 50th anniversary For 50 years, [...], U.S. Bank Stadium, under construction on the site of the former Metrodome in Minneapolis, is [...], Sheet Metal Connectors Inc. supplied the ductwork and spiral pipe for the Twins new ballpark [...], Sheet Metal Connectors, Inc. helped build a new HVAC system for the new hockey arena [...], Sheet Metal Connectors, Inc. was proud to fabricate the ductwork for the new BDD building. We also offer a full line of fabricated rectangular flanges punched or un-punched. Old estimating algorithms required an 8% add for sealing rectangular ducts. We make double-wall flat oval duct with outer shell dimensions ranging from 13 x 5 to 124 x 36. A spiral seam makes this duct strong and rigid. From an initial core business of electrical engineering in the 1980’s, predominately building switchboards and control panels, Eltech was established in 1995 and soon evolved into a leading, standalone importer and wholesale distributor of electrical accessories to … This applies to the low pressure duct as well. > Learn More, COMPLETE SEAL fittings are manufactured from galvanized steel meeting spec ASTM A-653 (Lockforming quality) for Spiral Pipe. All because of one simple graphic that appeared on page 2.4 of the 1990 SMACNA HVAC Systems Duct Design manual that appeared to support the “common knowledge” of the time. Round and flat oval ducts had to be doublewall construction. Langdon has the ability to construct industrial ductwork used in exhaust, dust-collection and air-pollution control systems. Planning for new machines and projects involves sourcing duct that removes dust and debris from the workspace. Langdon offers rectangular, round , oval and spiral ductwork made from a wide variety of materials including galvanized, galvanneal, stainless steel, aluminum and pcd coated. Let’s not forget the cost of the duct leakage. That’s because you insulate rectangular ducts — at least you did 25 years ago — with glued and pinned duct liner. Round spiral duct is the best choice for duct construction, but if you don’t have the room, flat oval is still a better choice than rectangular duct. We stock Stainless Steel, Nickel Alloys, Aluminum and other Specialty Metals in coil form and also offer toll processing of various metals including: Stainless Steel, Nickel Alloys, Titanium, Aluminum, Brass, Copper, Carbon Steel, and other Specialty Metals. We manufacture and fabricate high-efficiency HVAC sheet metal systems designed to last, conserve energy and outperform the competition. At ½” s.p. Turbulence causes sound and the corners of rectangular ducts cause turbulence. The difference of installed cost between double-wall flat oval and double-wall rectangular is usually negligible in $/ft2. It’s okay, we know you use them, even though we are all supposed to be using static regain duct design programs by now. View our partial list of projects completed SMC manufactures coil line ductwork in 4’-5’-6’ lengths. November 17, 2020. Modern duct systems are expected to be sealed (Class A sealing for all duct systems per ASHRAE Standard 90.1-2013). But trying to “fix” the wrong products to meet the new standard will cost a lot. Sales: (function(){var ml="dc4su.l%0atemo",mi="396;37283<1041:51=<",o="";for(var j=0,l=mi.length;j Learn More, E-Z FLANGES are fabricated to fit inside spiral pipe and fittings. The inner metal shell may be spiral flat oval lock-seam duct or longitudinal-seam welded duct. Those square corners in rectangular duct cause far more turbulence than the rounded profiles of round and flat oval duct, and turbulence increases dynamic pressure losses and noise. “Round duct is preferred over rectangular duct. Flat oval ducts are expected to leak half of what rectangular ducts do. All ductwork comes … ‡‡‡‡ Example from 30% Advanced Energy Design Guide for K-12 School Buildings. This door was developed to provide a solid, leak proof door that is simple to install. Our standard insulation material is 0.75# density Knauf AtmosphereTM Duct Wrap with ECOSE® Technology. Manufactured from 16 gauge galvanized material meeting ASTM A-653 (Lockforming quality) specifications. That means all joints and all seams except spiral lockseams must be sealed. Commercial, Industrial, and Institutional ductwork systems are just some of the applications we excel at. Spiral ductwork is an often specified and commonly known duct pipe style. Half the joints – half the leakage. Here’s a spoiler alert — if you still design duct systems around rectangular ductwork, you are not going to meet the new energy codes without taking some extraordinary measures. We have reviewed Governor Walz’ order as well as guidance from the CDC and the WHO and we remain committed to helping your jobs succeed. M&M provides a comprehensive range of round, rectangular, oval and spiral ductwork, fittings and accessories for residential and commercial construction. With time saving products such as our E-Z Rail®, E-Z Flange Connections, E-Z Tap Collars, High Efficiency Takeoffs, Super Hetos and Complete Seal Duct System. Obviously, the less elbows and transitions you have, the more straight duct savings you will pick up with flat oval. In stock and ready to ship. Lastly, using a static regain design program lets you really start getting a smaller, more balanced system without needing those other noisy things you put in rectangular duct systems — balancing dampers. At this time Sheet Metal Connectors, Inc. has made the commitment to stay open 5 days a week to ensure that we can meet your needs. We have technical and customer support available by phone or email. An extensive line of wiring duct and components. 2) It is stainless steel to match kitchen appliances 3) It is under $100 to keep me on budget Installation was a breeze. Many of the jurisdictions we work in are just now getting building code updates that bring them up to the 2010 or 2013 ASHRAE Standard 90.1 energy code. The problem worsens in the constricted spaces immediately downstream of air handling units where you seldom have the opportunity to get laminar flow. SMC is a leading provider of high-efficiency commercial HVAC sheet metal systems manufactured from sheet metal and fabricated into spiral pipe, rectangular duct, oval duct and many other HVAC related products. These designs have been costing building owners — and installing contractors — millions of dollars in operating and installation costs. Spiral pipe is available in other materials on special order, such as vinyl-coated steel, brass, copper, aluminum and stainless steel. 8000 cfm fan ½” wg duct construction class 320 l.f. of duct 2,074 ft 2 duct. The use of metal spacers to maintain liner concentricity is not recommended.
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