alpha_win 0.005 "Windows absorption coefficient"
alpha_dash 0.01 "Dashboard absorption coefficient"
alpha_door 0.01 "Doors absorption coefficient"
d_carp 0.5[cm] "Thickness of the carpet floor"
Rf_carp 10000[Pa*s/m^2] "Flow resistivity of the carpet floor"
d_roof 0.7[cm] "Thickness of the roof trim"
Rf_roof 20000[Pa*s/m^2] "Flow resistivity of the roof trim"