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2. Process duct work - Wikipedia

   en.wikipedia.org/wiki/Process_Duct_Work

   Round duct support rings are spaced, often at three diameters, or as require at up to about 50 ft centers (14 m). At this spacing the main support rings are designed for the sum of suction pressure stresses & support bending moments. Round ductwork allowable compressive stress is = 662 /(d/t) +339 * Fy (tubular steel structures, chapter 2).

3. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   Round duct is made using a continuous spiral forming machine which can make round duct in nearly any diameter when using the right forming die and to any length to suit, but the most common stock sizes range evenly from 4" to 24" (10-60 cm) with 6"-12" (15-30 cm) being most commonly used. Stock pipe is usually sold in 10' (300 cm) joints.

4. Duct (industrial exhaust) - Wikipedia

   en.wikipedia.org/wiki/Duct_(industrial_exhaust)

   Industrial exhaust ducts are pipe systems that connect hoods to industrial chimneys through other components of exhaust systems like fans, collectors, etc. Ducts are low-pressure pneumatic conveyors to convey dust, particles, shavings, fumes, or chemical hazardous components from air in the vicinity to a shop floor or any other specific locations like tanks, sanding machines, or laboratory hoods.

5. 40 of the best Martin Luther King Jr. Day deals: Save at ...

   www.aol.com/lifestyle/40-of-the-best-martin...

   This one from RENPHO is for larer rooms of the home and can handle up to 600 square-feet of space. ... measures 27.9-inches wide by 13.4-inches deep by 62.5-inches tall. ... shoes for those with ...

6. Turning vanes (HVAC) - Wikipedia

   en.wikipedia.org/wiki/Turning_vanes_(HVAC)

   Turning vanes inside of large ductwork Turning vane close-up HVAC turning vanes are sheet metal devices inside of mechanical ductwork used to smoothly direct air inside a duct where there is a change in direction, by reducing resistance and turbulence .

7. Sneaking a president from DC to Kyiv without anyone noticing

   www.aol.com/news/sneaking-president-dc-kyiv...

   President Joe Biden’s motorcade slipped out of the White House around 3:30 a.m. Sunday. No big, flashy Air Force One for this trip -– the president vanished into the darkness on an Air Force C ...