Abstract: A method for cleaning, sanitizing, and disinfecting commercial and residential HVAC system includes applying low pressure cleaning foam to heat-exchange coils of the HVAC system, the cleaning foam including one or more agents that break down organic and/or inorganic fouling dirt or debris, the foam removing and carrying away dirt or debris from the coils. Moving air, such as from the air handler of the HVAC system, pushes or draws the cleaning foam from the first side of the coils toward a second side, the cleaning foam and removed dirt or debris exiting the second side of the coils. The moving air and cleaning foam move co-currently in the same direction through spaces in the coils.

Abstract: A method for cleaning, sanitizing, and disinfecting commercial and residential HVAC system includes applying low pressure cleaning foam to heat-exchange coils of the HVAC system, the cleaning foam including one or more agents that break down organic and/or inorganic fouling dirt or debris, the foam removing and carrying away dirt or debris from the coils. Moving air, such as from the air handler of the HVAC system, pushes or draws the cleaning foam from the first side of the coils toward a second side, the cleaning foam and removed dirt or debris exiting the second side of the coils. The moving air and cleaning foam move co-currently in the same direction through spaces in the coils.

Abstract: An apparatus includes a silica container that contains a plurality of silica particles such that a first subgroup of the plurality of silica particles is located within a first chamber of the silica container and a second subgroup of the plurality of silica particles is located within a second chamber of the silica container. The first chamber receives a negative electrical current and the second chamber receiving a positive electrical current. Further, the apparatus includes a plurality of magnets. Each of the plurality of magnets receives an electrical current. In addition, the plurality of magnets is arranged to surround the silica container so that a magnetic field exerts a force on at least one of the silica particles to remove an electron from the silica particle to cause the silica particle to replace the removed electron by absorbing an electron from the atmosphere.