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2. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   Older furnaces sometimes relied on gravity instead of a blower to circulate air. [1]Gas-fired forced-air furnaces have a burner in the furnace fueled by natural gas.A blower forces cold air through a heat exchanger and then through duct-work that distributes the hot air through the building. [2]

3. Forced-air - Wikipedia

   en.wikipedia.org/wiki/Forced-air

   When the thermostat calls for heat, blower and element come on at the same time. When thermostat is "satisfied", blower and element shut off. Requires very little maintenance. Usually more expensive to operate than a natural gas furnace.

4. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   This limit controller may shut the furnace off if the blower fails or if something is blocking the air flow. The heated air is then sent back through the home through supply ducts. In larger commercial applications, central heating is provided through an air handler which incorporates similar components as a furnace but on a larger scale.

5. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   The fourth category of furnace is the high-efficiency condensing gas furnace. High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as ...

6. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/HVAC_control_system

   Some signs that could lead to a potential problem is if the HVAC system does not provide air cool enough. [citation needed] That could be due to a leakage in the cooling fluids. Another sign that could mean that the HVAC system is not running perfectly fine is if there is a bad smell to the air that it is providing.

7. Gas heater - Wikipedia

   en.wikipedia.org/wiki/Gas_heater

   Another example of a non-flued gas heater, running on natural gas. Non-flued heaters – also known as unvented heaters, vent-free heaters, or flueless fires, may be either permanently installed or portable, and sometimes incorporate a catalytic converter. [1] Non-flued heaters can be risky if appropriate safety procedures are not followed.