Right
bpc who have been so good - think linking the pan extraction to the mvhr is plain wrong . One as stated the seal needs to be broken to allow this and also the volume of extraction at the pan will be limited . Am I correct extraction only occurs on flushing therefore isn’t permanent? - of course they want it permanent. I think they were concerned about combining 2 different things together . So on their advice I think i’ll Leave it as is ....