The ducts are made of galvanized steel and have a shiny, silver appearance. Furnace ducts can be painted, but using the correct kind of paint is necessary for the best results.

Is it safe to paint ductwork?

It’s best to use latex paint, and because ducts are located in out-of-the-way places, you can usually get away with using a paintbrush. If the ducts are prominent, though, you may want to spray paint them.

Can you paint the inside of heating ducts?

Interior metal heating ducts are subjected to constant changes in both humidity and temperature. … Repainting ducts with the correct paint will remove rust and eliminate expensive repairs.