It looks like a 28'' cubed FB would put you at 107% of the recommended size which is about where I build mine. I'll try to post a picture of the specs that I ran through the pit calculator.
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Last edited by Big T on April 22nd, 2016, 8:48 pm, edited 1 time in total.
The screen shot didn't work out. I'm not sure who's using a 24'' FB on a pit that size but it's too small to perform correctly. I like to keep my FB in the 105%-115% max , I would use a larger diameter pipe for the stack or use twin stacks. I like to keep my stack tall enough to keep the smoke out of my eyes but short enough to clear a garage door. The larger the diameter the shorter the required length is. What kind of tank are you using? I ask because your FB doesn't have to be square as long as it's the correct volume, it can be rectangular if that's what you need to fit you tank. If you can't find the answers that you need in the forum, feel free to ask and we'll do our best to help you.
Thanks guys, pretty much my thoughts on the FB size, and since the exhaust is calling for nearly 60" that is much taller than I'm comfortable with so I had planned to use two 4"x30" stacks since I can get 4"x 10' pipe from my work for free. I also thought 266.5 was an odd size but that's what I got from the calculator.
Yeah Pete I had always called them 275 gal tanks but in the name of accuracy decided to call it what it is. Now for the two stacks I'm assuming actual location is mostly user preference as far as spacing between each stack, I'm planning on placing them either at or just below the bottom rack about 8" above the FB and RF plate and was considering spacing them out but not sure exactly how much
I'm planning on doing 3 full length racks, with split doors and was planning to weld flat bar/square tube around the doors and use the flat gasket from the site.