Right. This has been a difficult one and we've contacted several FCU manufacturers.
It would appear that there are several issues involved including the number and location of fans within the unit, size and shape of plenum box, etc. and (judging by the response from manufacturers) it would be wise to contact them and seek their recommendations as these do differ.
Perhaps it's important to make a selection of preferred supplier/manufacturer early in the contract to avoid abortive draughting and co-ordination time (if this issue is taken on board and then found not to be required, or vice- versa) or possible additional material costs if the ductwork is routed to accomodate this issue and then found not to be required.
Anyone else have a view on this?
