It is an excellent structural standard that’s mostly showing you one thing — how to limit deflection. Built-Up Insulation Board with External Lagging, Vocational woodworking shops in secondary and technical education facilities, Duct systems operating at -15” WG and less, Systems in operation less than 1,000 hours per year, Industrial Ventilation — A Manual of Recom-mended Practice for Design (30th Edition – 2019) — ACGIH, Round Industrial Duct Construction Standards (2nd Edition – 1999) — SMACNA, NFPA 91 – Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Particulate Solids – 2020 — NFPA, Chapter 19 “Duct Construction” — 2016 HVAC Systems and Equipment Handbook — ASHRAE, Chapter 21 “Duct Design” — 2017 Fundamen-tals Handbook — ASHRAE, Chapter 8 “Educational Facilities” — 2019 HVAC Applications Handbook — ASHRAE, Chapter 33 “Industrial Local Exhaust Systems” — 2019 HVAC Applications Handbook — ASHRAE.

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. Note — metal spacers are not used to maintain concentricity between inner and outer shells. Mastics should not be used on the interior of sawdust collection systems. 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. They should be spaced a maximum 12 feet apart for ducts 12” diameter and smaller, and maximum 20 feet apart for larger diameters. SPOT Flange For suspension of circular ducting, with vibration-damping internal rubber lining. Long Seam Weld Flange. And this is truly a round duct, not an 8 or 12-sided adaptation from rectangular duct. Most engineers and contractors that work with educational facilities are familiar with standard HVAC design practices and SMACNA duct construction standards. The recommended detail for drawings is illustrated. Figure 1: Typical detailed drawing of purlin clips. Consider the need for added stability and strength for heavier applications. 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. You don’t have to seal the spiral lockseams of the spiral ducts. 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. What are the dos and don’ts of round duct supports for roofing installations? In addition to durability, that is also the lightest gauge that can be consistently welded in most production facilities. Where rectangular duct is normally provided in 4 or 5 foot nominal lengths, the standard for spiral duct is 10 feet with lengths as much as 20 feet commonly provided. The only mechanical seams that do not have to be sealed under this standard are the spiral lock seams of spiral duct. Free Curbside pickup – Schedule your pick-up to save time ∝.

Round and flat oval spiral duct is expected to leak only 75% of the allowance. 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. The Kingspan KoolDuct® insulation is closed cell.



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