Codsiga dharka zebra-ka ee loo yaqaan 'Groupevescreen'
1. Dhismayaasha guud (gymnasium, masraxa weyn, gegida dayuuradaha, xarunta bandhiga)
Dharka guud ahaan waxay u baahan yihiin inay la kulmaan heerka B1 (oxygen index ≥32) heerarka dab iyo olol
2. Dhismaha xafiiska (xafiiska, qolka shirarka, lobby)
Wajahida bari iyo galbeed guud ahaan waxay doortaan dhar leh 1% -3% furfurnaan;woqooyi u jeedda guud ahaan dooro maro leh 10% furfurnaan;Koonfur u jeedda guud ahaan dooro maro leh 5% furfurnaan.