That's 216 sq in, not %. That is the throat area and is the opening from the firebox (FB) to the cook chamber (CC). Feldon's calc uses a semicircular shape, which is not the most efficient use of space. Try my Throat calc for cylindrical tanks or the Trapezoidal calc. Either will keep the FB as low as possible.recommended fb to cooker opening 216.00%
That will give you a larger volume than what you have. It calculates assuming flat ends. I calculate it to be a 325 gallon tank.I put it in as a cylinder the diameter 30" length 115"
The dam height is if you want a grease dam. It's just a 1" or so high flat bar to stop melted fat getting where it's not supposed to go. If you're building a RF, you can make a grease dam on the end of the baffle plate. If you're making a standard offset, you need a grease dam at the throat opening so it doesn't get into the FB and cause a flare up (at best).What is the "dam height"
You cut back from the belled end to the cylinder at a height of 10.316" from the bottom. If the tank is laying on the ground, situated the way you want, take a piece of some scrap cut at ~10 3/8" long and use that to trace your mark onto the tank by standing the scrap piece on the floor and mover it around the tank end and mark. That should equate to an opening width at the top of the cut-out of 28.5". On the FB end, you can tack the end plate to the tank (before the FB is put together) and mark around outside of the tank for the shape or use some cardboard instead and transfer it to the end plate. It'll be easier to weld if the tank protrudes into the FB a little.Shawdawg74 wrote:28.5 Top width of cut-out.:
0. Bottom width of cut-out:
10.316. Height of cut-out:
0. Calculated Dam Height:
215.235 Calculated Area:
I'm not under standing how to cut the throat out these are the measurements off of the throat calculater
The big guy (Frank) advises 75% of throat area for the baffle plate gap to increase air flow.Shawdawg74 wrote:Ok now how big should the opening be at the other end of the baffle plate will it be the same as the throat 216 sq in.
You'll want 81 inches of open area total for the vent. It doesn't hurt for it to be bigger because you can always close it off.Shawdawg74 wrote:Figured I'd be back sitting down and putting it on paper and the fb intake area is 81 sq in. And the count of intake is 2. I put it it in as 12x3 now is that the siz of the vents or the slide with the holes on the vent . My thinking was that the 12x3 was the size of the area I wanted my vents and cut the number of vents it calculated out in it . Any advice on the fb intake. I hope this question isn't to confusing.
