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Chicago plenum, 1-1/2" deep, flat, 4" square double gasketed extension rings create an air tight seal between boxes and extension rings. They are added to junction boxes to increase wiring capacity and provide access for additional conduit runs and electrical wire. Garvin Industries’ extension rings prevent the need to remove old conduit boxes and wiring from circuits when additional wiring is needed. Their bottom mounting slots allow a quick installation onto existing boxes. Red painted extensions rings are also available for fire alarm circuit identification.
Application: These flat covers are used to cover box wiring and provide a means for access when future conduit runs are required.
Advantages: Garvin Industries’ flat covers have unique mounting slots or captivated screws that allow quick access to circuits so additional wiring can be pulled.
Field Names: 1900 cover, 4S cover, 4S blank cover, box cover, box blank, blank plenum cover, 4S box cover, 4S plenum cover, Chicago plenum J box cover, junction box cover, vapor tight cover, 1900 blank, 1900 plenum blank.
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