Anybody know where I can get a custom stencil made to paint words on an air cleaner?

A good powder coating shup can do that .
Thanks a lot for that idea. I've been powder coating for about 20 years. I think if I did it in powder, it would look to nice. I don't think I could get that 'rubber stamp' look.
Pretty sure that was done with a stamp originally. The exact process name is not coming to mind but used a pad with an ink loaded stencil. If the finish is important to you, take that into account. If you paint them with a stencil, it will look significantly different than what is in the picture. The letters will be filled out and crisp. You might be able to go back over and blot or age the white letters but that is beyond my pay grade. Good luck.
I hadn't thought of that. Thank you VERY much for your input.
Get a rubber stamp made for about 20 bucks. What I did for the heat box stamp..

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One of many. Easily Design Custom Rubber Stamps with StampMaker
Thank you VERY much for that idea. I will look into that tomorrow.