Product review (3 stars): good product, not so easy install
Step one, order and wait for shipment.
Step two, send wife for spa weekend.
Step three, gut 16" x 36" and add cross beam to 16" studs. Mount holes are 9" spacing. Hard wire is best option vs the crappy plug they include, 6" opening works well with a standard tin 90 and exterior vent.  Hang a few times to verify 1/4" from where drywall WILL be so the stainless cover mounts flush to ceiling.  Crappy design of 90 degree bent stainless sheathing to radius cut glass.  I am a machinist and sheetmetal guy so i made it fit like a teen screwing in the dark.  Oh, Caulk n screw vent last!!!