I'm trying to perform a home radon test, the first step in the instructions for the Pro-Lab Radon Gas Detector Kit read that I need to close all the windows and doors for 12 hours before hand.
Do I need to close the windows and doors in the entire house when doing a radon test, or just the ones in the basement and the door to the basement?
Also the door to the garage that leads to the basement doesn't close (no steps everything is on the same level). But I can keep the garage door closed, will this effect the result?