Final answer:
SMACNA standards are used under the LEED Energy and Atmosphere category, aiding in achieving energy-efficient and sustainable indoor air quality.
Step-by-step explanation:
The standards set by the Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) are primarily utilized within the LEED (Leadership in Energy and Environmental Design) category of Energy and Atmosphere, specifically concerning indoor air quality and energy efficiency. SMACNA's guidelines are designed to ensure proper ventilation and minimize the environmental impact of buildings by promoting energy-efficient and sustainable HVAC (Heating, Ventilation, and Air Conditioning) systems. These standards play a crucial role in LEED's aim to improve the energy performance of new and existing buildings, thereby contributing to LEED points related to energy conservation and sustainability.