Abstract: The roof light system is composed by a roof unit (10), a light conduit (70) and a diffuser unit (80). A ventilation device has a ventilation tube (60) is separate and detached from the light conduit (70). The first end (60a) of the ventilation tube is connected with the roof unit (10) and the second end (60b) is positioned at a distance from the diffuser unit (80). The ventilation device may additionally have a branch tube (160).

Abstract: The roof light system is composed by a roof unit (10), a light conduit (70) and a diffuser unit (80). A ventilation device has a ventilation tube (60) is separate and detached from the light conduit (70). The first end (60a) of the ventilation tube is connected with the roof unit (10) and the second end (60b) is positioned at a distance from the diffuser unit (80). The ventilation device may additionally have a branch tube (160).

Abstract: An improved apparatus for UV wastewater purification in septic tank systems disposed in piping located between tank and drainfield and method for use, comprised of an inlet end, removable for cleaning, a descending section, a connecting section, a vertical section, with outflow tube, and containing a UV light, having provision for preventing removal when illuminated, with protective tube spanning its vertical length, with a built-in bottom insert with ports therein to restrict passage of solids and a built-in top insert with a port therein to hold the UV socket and photocell which communicates to a remote control panel.