All the register covers and the return air vent covers in my house are beat to shit. Painted, rusty & bent. Some are also broken and don't open/close. I want to replace them with new ones as I work through painting each room.
Went around measuring them, and I have 7 different sizes for the registers and 3 for the returns, at least from the outside. Can I work on standardizing these, at least some? House was built in 1919, so the vents and ducts were probably added in a retrofit.
Also, I've got 2 return air vents in the living room that someone had sealed half of, so I'll need to get smaller covers for them. They're about 2.5 feet long currently, and the open length is comparable to the other vents. I don't think there's an issue in terms of system functionality.
I don't know what I don't know, so would appreciate advice.