This glossary includes more than 300 solar terms, as well as hundreds of additional sustainable design and construction terms.
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 AllDefinition: The dust spot efficiency test is a semi-quantitative measure of a filter’s collection efficiency for fine particles---those associated with smudging of the interior surfaces of buildings. Upstream and downstream paper target filters collect particles and the opacity (light transmission) is measured.