2x3 Arch

[Z/MAN]

As the owner of a homebuilt 2x5 arch plated down for a 2x3 pan ( see #7 above) I think your 19" deep firebox will work fine. I wish I had made mine that size. I also have the 90 degree bend at the top although mine is just about 1 1/2" without the 45 degree riser. I have a 10" stack because it was free and it works great. I get 12 GPH out of mine but I attribute that to my wood. I burn 2x4 and 2x6 scrap cutoffs that I get from a modular home factory. They burn extremely hot and fast giving me a stack temp pushing 2,000 degrees without a blower. I know that is crazy but it works for me. Looks like you have a good plan but I wonder if that 2x3 pan will fit on a 25.5" arch?

[HondoLane]

The 25.5" is the outside dimension. I plan on using a 1.5" angle iron which will give me a 3/4" area for my pan to rest on. I went off SL Corsair Footprint dimensions.

As far as the stack goes... Really want to go with 8" but cant decide on best setup.. Single wall off the base stack to a double wall sections through the roof? Or run straight double wall? Menards has the best prices that I can find. Class A in 8" with a roof jack I am at $580. I see they have Selkirk Brand? 8" black matte outside, stainless inside with a 6" combustible clearance is just over half price.

[littleTapper]

Design looks good to me. You under-pan airspace cross-section is ~30 square inches and the area of a 6" circle is ~28.3. 8" would remove any worry of draft, but with a blower I suspect 6" will be fine. I burn through at least 1 section of single wall pipe (first off the base stack) every season. Last season was 2 pieces destroyed (I run ash and elm super-hot). The metal near the connection just disappears. If I had a shack I'd go black pipe for the first section or two then insulated doublewall for the rest and expect to spend a few $ a year. I'd hate to destroy some of that expensive stuff. But, maybe it holds up - hopefully someone else can chime in.

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[HondoLane]

That’s a good way to look at it with the numbers you posted. I see menards has a brand of pipe called Selkirk. They have an 8” pipe double walled non insulated that is reasonably priced. Got to see if they have a roof jack for it. It’s 8.5” OD and claim a 6” clearance to combustibles.

[HondoLane]

Had second thoughts at the last minute. Went 2x4!!! Now comes arch fabrication! I’ll post some photos as I go!

[HondoLane]

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Construction has begun on the arch. Going with a 1.25” x 1/8” angle iron frame. Front is CNC plasma cut from 10ga.

[HondoLane]

Question:

I CNC plasma cut my base stack hub from 10ga plate. I am going to reinforce the 20"x4" opening with angle iron which will serve 2 purposes.. stiffen up the base stack hub and allow for a place to seat the base stack. Do I need to insulate the underside of the base stack hub plate with ceramic insulation? I have studied several different manufacturers and homebuilt ones on here and I can't get a definitive answer.

[raptorfan85]

I built the back base stack section on mine from 1/4 plate and did not insulate it. If you do it with 10ga I would definitely insulate it. Theres a lot of heat there and if you dont I would think it wouldnt last very long. The amount of heat comming off mine during the test boil was impressive.

[HondoLane]

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Moving along. Top frame and base stack mocked up. I made my base stack from 18ga.

[HondoLane]

How do you edit photos to orient them the correct way. I take phot 4 different way and they all turn out either sideways or upside down