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So the ranghoods are venting to the outside exterior outlet, but inside they seem to be lacking in power yes?
Is RH60 the full model number of these rangehoods also please?
There is a lack of suction - it does not even move a sheet of paper if held close to the vent. The motor runs smoothly and the variable fan seems to work but there is only sound. Yes the full no. is RH60 Kleenmaid.
The venting to the outside is 150mm. There are two elbows and the length would be maximum 2 1/2 metres from the rangehood to the outside.
As for the cabinet, it is 360mm in depth but I'm unsure what you mean by 'fairing'.