Waylon wrote:
I'm getting an hrv installed but i need to know wheres the best place
to install the intake/exhaust ports; in the ceilings of a foot below
the ceilings in the wall

It's not being installed in conjunction with your HVAC system? It's likely
the installing contractor should know, but if he doesn't, you can seek
advice through the instructions that come with the apperataus.

--
Zyp