[Richard]

Attached a couple of pictures of my floor heat outlet. Do the square/rectangular openings require a door that can close or open? Took this out a long time ago and am converting to factory type A/C-heat boxes. There are some doors that can be opened in the heater core enclosure. Wondering if those should be in lower heat outlet. Maybe someone cut the holes before I bought the truck? Any input would be appreciated.
Richard