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2. Polyvinyl chloride - Wikipedia

   en.wikipedia.org/wiki/Polyvinyl_chloride

   In a fire, PVC can form hydrogen chloride fumes; the chlorine serves to scavenge free radicals, making PVC-coated wires fire retardant. While hydrogen chloride fumes can also pose a health hazard in their own right, it dissolves in moisture and breaks down onto surfaces, particularly in areas where the air is cool enough to breathe, so would ...

3. CertainTeed - Wikipedia

   en.wikipedia.org/wiki/CertainTeed

   Certainteed manufactures products for four industries : Roofing, Siding, Insulation, Gypsum and Ceilings. [3] It exports building products to more than 50 countries. CertainTeed has held more than 350 patents on its products in the past 30 years.

4. Plenum space - Wikipedia

   en.wikipedia.org/wiki/Plenum_space

   Vertical section through a commercial building using HVAC plenum instead of airspace plenum. When both the supply and return ducts are constructed in this manner, it is possible to insulate the ducts and the dropped ceiling so that the upper airspace is not heated or cooled, increasing energy efficiency.

5. News, Politics, Sports, Mail & Latest Headlines - AOL.com

   firefox-startpage.aol.com

   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

6. Flat roof - Wikipedia

   en.wikipedia.org/wiki/Flat_roof

   PVC roofing is a Thermoplastic system, meaning that it is heat-welded at the seams forming a permanent, watertight bond that is typically stronger than the membrane itself. PVC resin is modified with plasticizers and UV stabilizers, and reinforced with fiberglass non-woven mats or polyester woven scrims, for use as a flexible roofing membrane.

7. The best artificial Christmas trees of 2024, tested by AOL

   www.aol.com/lifestyle/best-artificial-christmas...

   You’ll generally want to leave at least 6 inches of space between the top of your tree and the ceiling, including the height of any tree topper. So for 8-foot ceilings, a 6- or 6.5-foot tree ...