Embodiments of the present disclosure include methods and systems of circulating air in an enclosed environment. In such embodiments, the system may comprise an air handling unit (AHU), the AHU including an indoor air inlet to receive an indoor airflow from the enclosed environment and an indoor air outlet to expel the indoor airflow, a conditioning element arranged between the inlet and the outlet configured to at least heat or cool the indoor airflow as it flows thereover, one or more fan units arranged between the inlet and the outlet configured to provide velocity to the indoor airflow, and an air treatment assembly (ATA) arranged within or proximate the AHU, the ATA including an air inlet configured to receive a portion of the indoor airflow received by the AHU indoor air inlet.

Embodiments of the present disclosure include methods and systems of circulating air in an enclosed environment. In such embodiments, the system may comprise an air handling unit (AHU), the AHU including an indoor air inlet to receive an indoor airflow from the enclosed environment and an indoor air outlet to expel the indoor airflow, a conditioning element arranged between the inlet and the outlet configured to at least heat or cool the indoor airflow as it flows thereover, one or more fan units arranged between the inlet and the outlet configured to provide velocity to the indoor airflow, and an air treatment assembly (ATA) arranged within or proximate the AHU, the ATA including an air inlet configured to receive a portion of the indoor airflow received by the AHU indoor air inlet.

A ventilation system that reduces indoor radon concentration includes indoor radon measuring devices installed in indoor spaces inside a building. A blowing device on an outer wall of the building or in a specific outdoor place includes an exhaust fan for exhausting air and an air supply fan for supplying outdoor air. An exhaust fan driving device drives the exhaust fan in the blowing device. An air supply fan driving device drives the air supply fan in the air blowing device. An air distribution device has upper and lower chambers and includes exhaust passages connected to one end of the exhaust fan to accommodate exhaust dampers that individually exhaust the air to the lower chamber. Air supply passages connected to one end of the air supply fan accommodate air supply dampers to supply the outdoor air and individually distribute the outdoor air to each of the specific indoor spaces.

A building panel may be installed below a slab in the construction of buildings. The building panel supports the slab and also provides a ventilation layer that may be depressurized to eliminate or reduce infiltration of radon gas into the building. The ventilation layer may comprise channels which provide a two-dimensionally interconnected void. Ventilation panels which include collars for connecting to ventilation systems may be provided. The panels may be installed directly on compacted soil. The building panels may additionally provide sub-slab insulation and/or a capillary break for water drainage. In some embodiments the building panels are formed substantially entirely of thermal insulating material such as rigid polystyrene foam. In an example embodiment the panels are approximately 4 inches thick and have a grid of intersecting channels formed on an underside of the panels.

A flexible cover plate with an airflow opening. A fan carried on a rear side of the cover plate over the airflow opening. A protective screen carried on a front side of the cover plate over the airflow opening. An angle bracket carried in an elongated slot disposed in said cover plate having a first portion extending parallel along the rear side of the cover plate, and a second portion extending transverse to the front side of the cover plate above the airflow opening. A flexible polymer foam sheet carried on the rear side of the cover plate for conforming to a vent opening in a building foundation wall so that an airtight seal is formed against the vent opening. A fan speed controller adjusting a desired speed of the fan and airflow through the airflow opening.

A ventilation panel for a soil gas barrier system includes: an insulating foam body having first and second opposing faces and a plurality of grooves to define, in cross-section, an interconnected plurality of ventilation channels having walls that extend into the ventilation panel from the second face toward the first face; and a film of substantially gas-impervious material attached to at least one of the first face and the second face.

A system for monitoring pressure within a volume defined by a wall has a housing and a manometer coupled to the housing having fluid therein. The manometer is coupled to the volume and has a fluid level corresponding to a pressure within the volume. A pressure sensor is coupled to the housing and is coupled to volume. The pressure sensor generates a pressure signal corresponding to the pressure within the volume. A controller is coupled to the pressure sensor and is programmed to compare the pressure signal to a threshold and programmed to generate an indicator based on comparing.

A system for monitoring pressure within a volume defined by a wall has a housing and a manometer coupled to the housing having fluid therein. The manometer is coupled to the volume and has a fluid level corresponding to a pressure within the volume. A pressure sensor is coupled to the housing and is coupled to volume. The pressure sensor generates a pressure signal corresponding to the pressure within the volume. A controller is coupled to the pressure sensor and is programmed to compare the pressure signal to a threshold and programmed to generate an indicator based on comparing.

A flexible cover plate with an airflow opening. A fan carried on a rear side of the cover plate over the airflow opening. A protective screen carried on a front side of the cover plate over the airflow opening. An angle bracket carried in an elongated slot disposed in said cover plate having a first portion extending parallel along the rear side of the cover plate, and a second portion extending transverse to the front side of the cover plate above the airflow opening. A flexible polymer foam sheet carried on the rear side of the cover plate for conforming to a vent opening in a building foundation wall so that an airtight seal is formed against the vent opening. A fan speed controller adjusting a desired speed of the fan and airflow through the airflow opening.

A flexible cover plate with an airflow opening. A fan carried on a rear side of the cover plate over the airflow opening. A protective screen carried on a front side of the cover plate over the airflow opening. An angle bracket carried in an elongated slot disposed in said cover plate having a first portion extending parallel along the rear side of the cover plate, and a second portion extending transverse to the front side of the cover plate above the airflow opening. A flexible polymer foam sheet carried on the rear side of the cover plate for conforming to a vent opening in a building foundation wall so that an airtight seal is formed against the vent opening. A fan speed controller adjusting a desired speed of the fan and airflow through the airflow opening.