In building modeling programs one always has to provide precise values for
infiltration. In the real world, I will know one of two things: almost
nothing (The building appears to be kinda leaky with old windows), or I will
have a blower door test done at a specific pressure. How do I convert
subjective ("kinda leaky") or objective (Blower door test) leakage into
numbers that make sense in the program? Is there a guide one can use?

--Lawrence