Mu dziko la firiri ndi kuziziritsa, kusankha kwa zida zopangira kumatha kukhala zothandiza komanso kukhala ndi moyo wautali. Kugwiritsa ntchito chimango cha PVC kwa ozizira kwakhala chikugwirira ntchito pakati pa opanga pazopindulitsa. T
Kuyeretsa chitseko chagalasi chowongoka kumafuna kupindulitsa, chisamaliro, ndi zida zoyenera kuonetsetsa kuti zonsezi ndi kumaliza. Kaya mukugwiritsa ntchito China Longrizer Photo la Magalasi, kuthana ndi chizolowezi champhamvu