I completed phase 3 of my door redesign over the weekend with better than expected results. I found a cheap cookie sheet set at Walmart for under 10 bucks with enough sheet metal to fabricate a more accurate vent opening to test. The foil pan used for the previous test worked great, but now I need to verify that a real adjustable butterfly vent will also supply adequate air flow.
The larger of the two sheets in the set fits perfectly between the hinges and the latch bracket, so I drilled some holes for 4 mounting screws, and cut out the vent opening at the bottom:
I made a vent template out of cardboard to make sure it fit right:
The finished vent viewed from inside the firebox. The door is fastened with butterfly fasteners to prevent any permanent modification to the cooker.
Vent wide open:
Plenty of air flow gets the fire burning with no need to open the door. In fact, since the door was bolted on I couldn't open it if I wanted. There's hardly any coals in the firebox when this photo was taken, the wood just burns by itself. I never had any smoke come out of this vent - ever. It was drawing in fresh air effortlessly all day.
I hit cooking temperature in record time. There seemed to be more pressure coming from the smoke stack than before.
I've never seen this cooker burn this clean. Sometimes I couldn't even see smoke coming from the smokestack at all.
This is after I had been cooking for several hours, and you can see I didn't have to have a huge coal bed to keep the logs burning. The logs just burn clean because they are getting enough air.
Overall I was very pleased with the results. My wife was probably getting tired of hearing me gloat about how awesome the smoker was working all day. Now I need to get a permanent 1/4" door with this type of vent. If Yoder doesn't make me one, I can always hire one of the local fabricators to do it. I hope to be the first Loaded Wichita owner with a properly vented fire door.