Looking for any suggestions for the following situation. The house we bought had a kerosene heater in the basement and vented through the base of the house which is vinyl sided. I am removing the heater and all the piping, venting and kerosene line. This is leaving a 3 1/2" hole in the side of the house where the vent piping went through. I looked at possibly using a dryer vent to close up the hole, but they look to be a standard 4" size. I am finding many suggestions on how to patch vinyl siding, but not any that address closing up a hole. I have looked at some vinyl vents, but they are not the correct size. Any ideas, suggestions or feedback would be appreciated.