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2. Ductwork airtightness - Wikipedia

   en.wikipedia.org/wiki/Ductwork_airtightness

   There are two major systems to classify ductwork airtightness, one based on European standards, the other based on ASHRAE standard 90.1-2010.Both are based on the leakage airflow rate at a given ductwork pressure divided by the product of the ductwork surface area and the same ductwork pressure raised to the power 0.65.

3. Duct (flow) - Wikipedia

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

   Kinks in flexible ducting must be avoided. Some flexible duct markets prefer to avoid using flexible duct on the return air portions of HVAC systems, however flexible duct can tolerate moderate negative pressures. The UL181 test requires a negative pressure of 200 Pa. To use flexible ducting in a system, make sure to pull the duct tight so you ...

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. Dayle Haddon dies in suspected carbon monoxide leak at ... - AOL

   www.aol.com/dayle-haddon-dies-suspected-carbon...

   Model Dayle Haddon died in a suspected carbon monoxide leak at the Bucks County home of her son-in-law, Hallmark movie star Marc Blucas, officials said.

6. Box Office: ‘Kraven the Hunter’ Bombs With $11 Million ...

   www.aol.com/box-office-kraven-hunter-bombs...

   Kraven may be the world’s greatest hunter, but the comic book villain couldn’t manage the climb to the top of box office charts. Sony’s “Kraven the Hunter,” a superhero spinoff starring ...

7. Process duct work - Wikipedia

   en.wikipedia.org/wiki/Process_Duct_Work

   Therefore, minimizing duct pressure drop by minimizing turbulence at elbows and transitions is of importance. Duct elbow radius is usually 1 1/2 to 2 times the duct size. The side slopes of transitions are typically 10 to 30 degrees. Note: the duct gas velocity is chosen to minimize duct dust dropout.

8. The 20 best sales this weekend: Candy for stockings, wool ...

   www.aol.com/lifestyle/the-20-best-sales-this...

   Consider this your formal warning: Christmas is less than two weeks away (!), so it's time to get a move on buying stocking stuffers and last-minute gift ideas — even if they're just gift card ...

9. MESC - Wikipedia

   en.wikipedia.org/wiki/MESC

   The system is a catalogue of specifications in the English language, to allow buyers to purchase standardised materials all over the world. When MESC was initially introduced, materials were allocated a unique 7-digit number. This was increased to ten digits in 1946. [1] The system has a numerical "coding schedule" of 10 digits to code the ...