I wonder if anybody else is having the same experience. Isn't the form supposed to calculate Vbz = Rp*Pz + Ra*Az? When I enter the values for the four parameters, the form is calculating a lower value for Vbz. Strange thing is, two weeks ago it was calculating as I expect it to, but now it is calculating differently.

For example
----------------
Rp = 5 cfm / person
Ra = 0.06 cfm / sf
Occ. Density = 36.29 per 1000 sf.
Az = 138 sf
Vbz (2 weeks ago) = 33.32
Vbz (now) = 25.12

Did something change with ventilation rates or is there a bug in the form here?

Thanks.