Joseberger

The duct blaster fan is placed over one in all the return air grills in the living room and the other percentage of the supply and return registers are taped without.

Typically quality plating can survive some engraving processes but more often these days the plating will peal or allow corrosion the particular engraving causing severe problems down the road.
Always dispose of grease in the garbage by using a tin should certainly.