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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site sealed combustion heating system A heating system that uses only outside air for combustion and vents combustion gases directly to the outdoors. Sealed combustion heating systems are less likely to suffer from backdrafting (drawing down gases from chimneys and flues) and to negatively affect indoor air quality. Related category    • HEATING Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP