Hi, I know many people don't like these but i've got it now and after a covered vent to go on the outside of the house. However, all the ones I have seen are plastic and wondered if anyone knew where I could get a nice quality metal one from. I have the firecraft fl05 and says it needs 100cm2 ventilation. Would also like a nice metal one for the inside but need to know what the proper names are so I know what to look for. Thanks