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  2. List of refrigerants - Wikipedia

    en.wikipedia.org/wiki/List_of_refrigerants

    For example, R-22 has one carbon atom, one hydrogen atom (21 = 1), two fluorine atoms, and one chlorine atom (4−21 = 1), so it is chlorodifluoromethane, while R-134 has two carbon atoms (21 = 1), two hydrogen atoms (3−1 = 2), four fluorine atoms, and no chlorine atoms (6−2−4 = 0), so it is one of the tetrafluoroethanes. This ...

  3. Copper tubing - Wikipedia

    en.wikipedia.org/wiki/Copper_tubing

    In the United States, it usually has yellow or light orange colored printing, common sizes being 1 + 1 ⁄ 4, 1 + 12, and 2-inch copper tube size. Types K and L are generally available in both hard drawn straight sections and in rolls of soft anealed tubing, whereas type M and DWV are usually only available in hard drawn straight sections.

  4. Bard (company) - Wikipedia

    en.wikipedia.org/wiki/Bard_(company)

    According to Bard and FDA records, at least 12 deaths and hundreds of problems had been linked to the G2 series filters. [12] In 2018, an Arizona court ordered Bard to pay $1.6 million to a plaintiff for injuries sustained from a G2 IVC filter implanted in 2007, plus an additional $2 million in punitive damages. [13]

  5. Packaged terminal air conditioner - Wikipedia

    en.wikipedia.org/wiki/Packaged_terminal_air...

    A packaged terminal air conditioner (PTAC) is a type of self-contained heating and air conditioning system intended to be mounted through a wall. [1] The first practical semi-portable air conditioning unit invented by engineers at Chrysler Motors. It entered the market in 1935, and was designed to fit under a window like many modern PTACs. [2]

  6. Air handler - Wikipedia

    en.wikipedia.org/wiki/Air_handler

    An air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning system. [1] An air handler is usually a large metal box containing a blower, furnace or A/C elements, filter racks or chambers, sound attenuators, and dampers. [2]

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