Kalkulesen bilong namba bilong ol 'vent' bilong faundesen
X - Waid bilong besmen
Y - Longpela bilong besmen
F - Seksenal seip bilong 'vent' bilong faundesen. Rektangular o raunpela.
D - Diamita bilong 'vent'.
A - Bikpela bilong wanpela 'rectangular vent'.
B - Hait bilong wanpela 'rectangular vent'.
E - Reshio bilong olgeta eria bilong ol 'vent' i go long eria bilong 'basement'.
Ol samting bilong program.
Kalkulesen bilong namba bilong ol 'vent' bilong putim win long faundesen.
Ol 'vent' em ol hul we i op long hap bilong faundesen we i stap antap long graun we ol i putim bilong putim win i go insait aninit long graun.
Dispela i stopim 'radon gas' long bung na ol 'mold' i no ken kamap long ol bilding straksa.
Ol 'vent' o ol 'vent' i stap long tupela hap bilong 'basement' bilong mekim gutpela 'ventilation' i go insait.
Em i gutpela long putim ol hul bilong win antap tru long graun.
Olgeta eria bilong ol 'vent' i mas i stap olsem 1/400 bilong eria bilong 'basement'.
Long ol hap we i gat planti 'radon', 'ratio' i mas i stap 1/100.