Abstract: A vapour conduit for use in an apparatus for bulk vapour phase crystal growth, an apparatus for bulk vapour phase crystal growth, and a process for bulk vapour phase crystal growth are described. The vapour conduit is a flow conduit defining a passage means adapted for transport of vapour from a source volume to a growth volume, wherein a flow restrictor is provided in the passage means between the source volume and the growth volume and wherein the flow conduit further comprises a flow director structured to direct vapour flow downstream of the flow restrictor away from a longitudinal centre line of the conduit and for example towards an edge of the conduit.