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
Choyamba, mfundo ya magetsi owotcha maginiki amapindika pamanja pakhomo lamagetsi limapangidwa ndi wosanjikiza wagalasi ndi wosanjikiza wa filimuyo. Kanema wa filimuyi ndi kanema woonda ndi mawonekedwe ofanana ndi mawonekedwe amphamvu, omwe amatha kutenthetsedwa mwachangu