I have a set of rusted brick vents caused by blocked stormwater pipes over several years. The stormwater pipes issue has been fixed and I'd like to replace the brick vents but they appear to be a non-standard size.
My brick vents are 290x145 mm and the bricks are 295x67 mm.
Welcome to the Bunnings Workshop community. It's wonderful to have you join us, and thank you for sharing your question about replacing non-standard brick vents.
The closest panel I could find in size is a Haron 300 x 150mm Silver Aluminium Pressed Wall Vent. But this will have to either be screwed on or glued to the brick. If you're worried about the vent openings you can bend the openings wider with a pair of pliers. The best part of this vent is that it is made of aluminium and therefore will not rust even when exposed to heavy rain or moisture.
The other option is to make a custom wall vent. I suggest using Metal Mate 0.5 x 300 x 900mm Plain Aluminium Sheet and drilling 12mm holes in the face to give you maximum ventilation. I've placed a sample sketch so you can see what it might look like.
Let me tag our experienced members @Adam_W and @TedBear for their recommendations.
If you have any other questions we can help with, please let us know.