[PAR] [TLE] HVAC [SEP] Heating, ventilation, and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort.  Its goal is to provide thermal comfort and acceptable indoor air quality.  HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer.  Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped, as in HACR (as in the designation of HACR-rated circuit breakers). [PAR] [TLE] Lennox International [SEP] Lennox International Inc. () is an intercontinental company.  Through its subsidiaries, it is a provider of climate control products for the heating, ventilation, air conditioning, and refrigeration markets around the world.  The Company was founded in 1895, in Marshalltown, Iowa, by Dave Lennox, the owner of a machine repair business for railroads.  He designed and patented a riveted steel coal-fired furnace, which led to numerous advancements in heating, cooling and climate control solutions.  The company was sold in 1904 to DW Norris who managed the company until his death in 1949, following which ownership devolved to his descendants who continued to hold a prominent position in the company in the following decades.
[PAR] [TLE] HVAC [ SEP ] Heating , ventilation , and air conditioning ( HVAC ) is the technology of indoor and vehicular environmental comfort . Its goal is to provide thermal comfort and acceptable indoor air quality . HVAC system design is a subdiscipline of mechanical engineering , based on the principles of thermodynamics , fluid mechanics , and heat transfer . Refrigeration is sometimes added to the field 's abbreviation as HVAC&R or HVACR , or ventilating is dropped , as in HACR ( as in the designation of HACR - rated circuit breakers ) . [PAR] [TLE] Lennox International [ SEP ] Lennox International Inc. ( ) is an intercontinental company . Through its subsidiaries , it is a provider of climate control products for the heating , ventilation , air conditioning , and refrigeration markets around the world . The Company was founded in 1895 , in Marshalltown , Iowa , by Dave Lennox , the owner of a machine repair business for railroads . He designed and patented a riveted steel coal - fired furnace , which led to numerous advancements in heating , cooling and climate control solutions . The company was sold in 1904 to DW Norris who managed the company until his death in 1949 , following which ownership devolved to his descendants who continued to hold a prominent position in the company in the following decades .
What mechanical engineering principles does Lennox International use in its HVAC products?
What mechanical engineering principles does Lennox International use in its HVAC products ?
thermodynamics, fluid mechanics, and heat transfer.
thermodynamics, fluid mechanics, and heat transfer.