Yes. Ceiling & Wall Planks (including MDF*) can be used in “dry” exterior applications (i.e. no direct contact with wet weather like rain or snow). For example on a porch ceiling where they will be exposed to temperature and humidity changes, but never get wet.
If you need planks that can withstand direct contact with wet weather see our Waterproof Barnwood Planks which carry a 10 year warranty.
*We recommend that the MDF Planks be sealed on the back (if not already factory primed on back) and painted with an exterior-grade paint on the front when used in these types of applications.