So I am rehabbing this house (built approx 1930), doing the finishing trim now. I go to put the store bought register vents in the front room, and the original vent "holes" are 3 1/4" out from the baseboard, all of the vent covers available now (that I could find) are only 3 inches deep.... needless to say this leaves 1/4" of exposed duct.
After a trip to all of the local stores, I figure I am going to have to make my own.
Found some clear pine in the scrap bin, some gutter leaf screen in the shed, a can of black spray paint, and got to work.....
That is with the first application of rubbing oil, will need a couple more applications to match that trimwork.
One thing I am not that happy about is that you can see the grey duct work through the screen if you look straight down, so I will probably add some sort of air deflector inside to hide it...