Hello. We are getting a new Mitsubishi ducted air conditioning system installed with their Lossnay fresh air ventilation system. We have been given couple of options of diffuser shape types. Circular vs Swirl. Stud height is 2.7M and diffusers will be installed in all rooms. Is there any advantage that one has over the other? In residential I have mostly seen Circular style but mostly in shopping malls and commercial offices, I have seen swirl type.