This includes recirculation fans, W.T. slide valves in recirculation systems and, in some ships, certain openings specially fitted for recirculation.
Oku kuquka iziphazisi ezijikelezayo, W.T. izivulo ezityhalwayo kwindlela yekuphinda ujikelezise umeya ne, kwezinye inqanawe, nezinye iindawo ezivulekaye ezifakelwe ukujikeleza.