Hey fellow facility managers! Our warehouse roof vents were failing every 18 months until we installed this roof fan. In UK weather, most roof units can't handle the constant damp, but these have survived two winters without any performance drop. The automatic shutters actually seal tight when not in use - no more heat escaping in winter like our old ones. Installation was simpler than expected thanks to the integrated flashing system. We've noticed more consistent temperatures throughout our 10,000 sq ft space since putting these in. The maintenance crew loves how easy they are to clean - just a quick wipe down every few months. Even our accountant's happy with the energy savings showing on our bills.