We have a house that was built in 1937 in Toronto. It is a double brick design. On one of the outside walls, I can see what appears to be a single-brick-sized vent and I don't know what its function is.
At first I thought it may be an air brick but after further investigation, I found that there is what looks like a cleanout on the inside wall in the same place as the vent is on the outside wall. Additionally, there seems to be a 1" pipe that runs down to the basement from the vent The pipe is capped in the basement. The previous owner said he capped it because water was coming into the basement via this pipe. I also know that there was a washer and dryer in the same area in the basement in this location previously.
Does anyone know what this vent, cleanout, and pipe may be for? It seems too small a diameter for a dryer vent.
EDIT: Brother suggested it may be a vent for an old oil tank. Possible?