Please contact your nearest representative for details. 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.

More and more owners and engineers are requesting it for its effectiveness in inhibiting the growth of damaging bacteria, mold and fungi. Some are as light as 25 gauge.

Dust collection systems are typically designed using the Constant Velocity method. Double-skin insulated round ducting requires engineered hangers. You need to limit surface deflection to prevent metal fatigue and duct rumble, and metal thickness and additional reinforcement were the ways of accomplishing this with traditional rectangular ducts. If you could do just one thing to your duct design that would make it more energy efficient and less expensive, would you do it? For larger duct diameters, flat steel bands need to be rolled to the right size. 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. 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. Most rectangular ducts need to be supported at least every 8’-0”. Static Pressure. Hanger and support spacings are greater for round ducts. This installation provides excellent support and security of the ductwork system. These are a wide gasketed clamp with a single tightening bolt.

11419 Yellow Pine St. NW The wire hangers are based on the Gripple hang-fast system. Operating Temperature — up to 250°F If the ductwork is supported from roof trusses, the spacing of the trusses determines where the hangers will be fixed. Perfect for reward program, prize draw or to offer as corporate gifts. But when you leave them off, you are usually going to end up with poor-performing and costly rectangular duct. The result is PhenoliDuct. It’s usually not very pretty.

Remember to calculate for the possible build-up of material inside the duct in the event of sub-par system performance or failure. Some of our calculators and applications let you save application data to your local computer. 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. A round duct experiences only about 40% of the wind force a comparable rectangular duct would see. The round profile greater flow efficiencies than rectangular ducts.

No, availability is not an issue. Round is the most efficient shape for transporting air. Can you weld metal on it without it smoldering, smoking or catching on fire?

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.

However, space (height) restrictions may require flat oval duct to achieve the low turbulence qualities of round ductwork.”. This type of hanger is favoured for exposed ducting in malls and supermarkets. The types of fittings to be used based on the designer's calculations of fitting losses (i.e., square versus 45 ° entry taps, conical versus straight taps, etc.). 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. Shop for Ductwork Hangers Online! Solid – standard metal liner in gauges and construction to contain the insulation and maintain concentricity and structural integrity. The product is ideally suited for systems with long, straight runs of duct — gymnasiums, cafeterias, airports, sports arenas and convention centers. 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). We can provide the metal shells as spiral duct or longitudinal seam welded duct, and in thicknesses from 10 gauge through 26 gauge. The number of fittings should be minimized and should be designed with the least amount of turbulence produced…. For suspension of circular ducting: combined connection nut M8/M10 and slotted quick closure. 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. That’s most often referring to the “2005 SMACNA HVAC Duct Construction Standards – Metal and Flexible”. If that’s the case, please make a big note on the plans — so we know to avoid that project.

Traditional Craftsmanship Rectangular connections and openings should be avoided because of their tendency for corner leakage. Factory-insulated duct products reduce field labor, as well as giving consistency and product features you won’t get with thermal wrap. Malleable iron casting with a hardened cup point set screw and locknut. 581 , Railway Street Phone: (519) 728-2940, New savings added daily for your favourite brands, View our weekly flyer with all valid deals in your area, Shop our clearance section to find great deals, Check out the latest weekly deals in all categories, 581 , Railway Street,

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. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. By anyone’s definition, this is an inherently “green” product. And with slip-joint construction you trim duct lengths of round and flat oval spiral ducts without compromising their integrity or performance. 11. SPOT Triple Rib Gasketed The fixing clamps must be close to the truss ‘node’ points (a node point is where the members of the truss join together). We can provide desirable characteristics such as fully-welded fittings without worrying about setting the insulation on fire. Length should be limited to the expected movement. And with less inherent leakage, you won’t need to produce as much air to start with. Round and flat oval spiral ducts constructed to Seal Class A are expected to leak 3 cfm/100 ft2 duct surface area at 1" WG. 9. These flanges can be connected with self-tapping sheet metal screws be-cause such screws will not penetrate the airstream. But the need for Minimum Transport Velocities prevents design methods such as static regain from being used to reduce system pressure drop. Double-wall construction allows you to contain the insulation media between an inner and outer metal shell. Keep in mind the chart above.

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