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2. 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 ...

3. Chlorinated polyvinyl chloride - Wikipedia

   en.wikipedia.org/wiki/Chlorinated_polyvinyl_chloride

   CPVC sprinkler pipe inside a firestop mock-up. Chlorinated polyvinyl chloride (CPVC) is a thermoplastic produced by chlorination of polyvinyl chloride (PVC) resin.CPVC is significantly more flexible than PVC, and can also withstand higher temperatures.

4. 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 ...

5. Reinforced thermoplastic pipe - Wikipedia

   en.wikipedia.org/wiki/Reinforced_thermoplastic_pipe

   Reinforced thermoplastic pipe (RTP) is a type of pipe reinforced using a high strength synthetic fibre such as glass, aramid or carbon. It was initially developed in the early 1990s by Wavin Repox, Akzo Nobel and by Tubes d'Aquitaine from France, who developed the first pipes reinforced with synthetic fibre to replace medium pressure steel pipes in response to growing demand for non-corrosive ...

6. What are angel numbers? A guide to the numeric sequences and ...

   www.aol.com/angel-numbers-guide-numeric...

   Here's a guide on angel numbers, or repeating numeric sequences often used as a guide for deeper spiritual exploration.

7. Bell mouth - Wikipedia

   en.wikipedia.org/wiki/Bell_mouth

   A bell-mouth inlet duct is a form of convergent inlet air duct used to direct air into the inlet of a gas turbine engine. The area of a convergent duct gets smaller as the air flows into the engine. A bell-mouth inlet duct is extremely efficient and is used where there is little ram pressure available to force the air into the engine.

8. Joe Manchin torches Democrats on the way out the door - AOL

   www.aol.com/news/joe-manchin-torches-democrats...

   As Joe Manchin prepares to leave Congress after nearly 15 years, the West Virginia senator — who left the Democratic Party and registered as an independent earlier this year — is further ...

9. Heads up if you’re a freelancer or small business owner: The ...

   www.aol.com/finance/heads-freelancer-small...

   Heads up to anyone who is a freelancer, independent contractor, business owner, property renter or just a hobbyist who occasionally sells their creations: If you accept business-related income ...