Other source:

Gohan and Amin won’t let Goku turn off the furnace for the simple reason that spirits wouldn’t have access to their afterlife especially evil spirits. Instead of helping Goku, Amin resorts to fighting him. Amin formulates a plan after seeing Goku has the Bansho fan. Luckily Chi Chi has both vital requirements on her. With aid of the Bansho fan and Amin lifting the pot, Goku descends into the furnace and manages to seal the hole, barely making it out alive. The flames at the castle have died down and the Ox King has survived and kept the wedding dress intact. Goku and Chi Chi proceed with their wedding and get married.