Amalahle / amashidi we-Galvalume (GL) amashidi asetshenziswa ikakhulu ekwakheni, embonini ekhanyayo, ezimotweni, njll. Emkhakheni wezokwakha, amakhoyili / amashidi we-galvalume asetshenziswa ikakhulukazi ekwenziweni kophahla ophahleni, ku-grille yophahla, njll. amashidi ayinsimbi enhle yesisekelo yamakhoyili / amashidi we-PPGL.