[lemma=□] □
[lemma=indoor] □
[lemma=air] □
These systems create challenges in the area of energy efficiency , indoor air quality and thermal comfort . Many mechanical contractors ( nonengineers ) are helpful in implementing changes to air-handling equipment , but may not have the mechanical engineering background required to design effective solutions.Architects : Architects are in a position to understand how building design can affect indoor air quality . Vehicle traffic near HVAC system air intakes can add carbon monoxide and other contaminants to the indoor air . This seminar provides insight into the indoor air quality and energy impacts of residential ventilation through recent research and practice .