400 ºC/2h centrifugal extractor fans and ...
400 ºC/2h belt-driven double inlet ...
400 ºC/2h, belt-driven extractor fan ...
400 ºC/2h, belt-driven centrifugal fans ...
F-400 extractor fan units with a large ...
400 ºC/2h centrifugal roof-mounted ...
The staircase, escape routes or ...