im thinking of building a waste oil forge, i like the idea and i can get as much used cooking oil as i want. i was looking at this design, http://www.backyardmetalcasting.com/oilburners10.html and it looks like it works, a few questions i have is what kinda fan can i use for this set up? i found a few forge blowers but $250 is kinda steep and im not sure how much cfm do i need. is there anything else i can use instead of a forge blower? another question i wanna ask is i would like to use this design to heat rods and square tubing so i'll have to make one that lays flat and with a different door any ideas or things i should look out for?