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Non-metallic not electrified rigid channels for construction use, namely, trays, troughs and covers; non-metallic not electrified rigid channels for cables, namely, trays, troughs and covers for cables; non-metallic ballast retention boards; non-metallic ballast retention and ballast board systems comprising interlocking non-metallic ballast boards; non-metallic rigid pipes for building; walkways, namely, non-metallic duckboards; non-electric ducting conduit installations of non-metallic materials, namely, non-metal ducts; non-electric, non-metallic ducting installations comprised of non-metal ducts