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2. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Clean air delivery rate (CADR) is the amount of clean air an air cleaner provides to a room or space. When determining CADR, the amount of airflow in a space is taken into account. For example, an air cleaner with a flow rate of 30 cubic metres (1,000 cu ft) per minute and an efficiency of 50% has a CADR of 15 cubic metres (500 cu ft) per minute.

3. Duct (flow) - Wikipedia

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

   Ducts for air pollution control in a 17000 standard cubic feet per minute regenerative thermal oxidizer (RTO). A round galvanized steel duct connecting to a typical diffuser Fire-resistance rated mechanical shaft with HVAC sheet metal ducting and copper piping, as well as "HOW" (Head-Of-Wall) joint between top of concrete block wall and underside of concrete slab, firestopped with ceramic ...

4. List of cleaning companies - Wikipedia

   en.wikipedia.org/wiki/List_of_cleaning_companies

   Spotless Group Holdings – an Australian holding company that includes commercial facility cleaning services in Australia and New Zealand. [9] Superior Rug Cleaning – founded in 1946, later absorbed Adams & Sweet which was founded in 1856. TaskRabbit – an online and mobile marketplace, that includes cleaning services, founded in 2008. [10 ...

5. Commercial cleaning - Wikipedia

   en.wikipedia.org/wiki/Commercial_cleaning

   This is an accepted version of this page This is the latest accepted revision, reviewed on 26 October 2024. Cleaning service provided for commercial buildings and establishments "Cleaning company" redirects here. For the Australian documentary film also known as "The Cleaning Company", see Clean (2022 film). This article needs additional citations for verification. Please help improve this ...

6. The 20 best sales this weekend: Kindle accessories, iPads ...

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

   Thousands of reviewers agree: the Shark Navigator Lift-Away Deluxe Swivel Vacuum makes cleaning a breeze. $149 at Amazon. Nordstrom. Bobbi Brown Lip & Cheek Oil. $22 $32 Save $10.

7. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   The space between floor joists can be boxed in and used as some of the ductwork, further lowering costs. The four different generations of district heating systems and their energy sources. Electrical heating systems occur less commonly and are practical only with low-cost electricity or when ground source heat pumps are used.