Abubuwan da ke haifar da iskar gas sun haɗa da carbon monoxide da hydrogen, na karshen faduwa a karkashin nau'in fashewar iskar gas na Class IIC. Ya bambanta da iskar gas, wanda IIBT4 kayan aikin wutar lantarki mai tabbatar da fashewar ya wadatar, Gas na kwal yana buƙatar amfani da IICT4.
Don ƙarin tabbacin aminci, gudanar da gwaje-gwajen rata ko ƙananan gwaje-gwajen kunna wuta yana da kyau.