Angled steam vent pipe?

[DaveB]

I'm looking to temporarily relocate my evaporator while I construct a new sugarhouse. My original goal was to have the new sugarhouse done this year but I don't know if that will be the case. I'm looking to temporarily make use of a workshop space that I have. It already has a wood stove that I can replace with my evaporator stack. My only issue is venting the steam. I'm thinking of adding a steam hood so I can vent the steam through a pipe but I can't send the steam pipe straight up through the roof. I'm wondering if I can have the vent pipe angled at 45 degrees and if that will work. Would I need some kind of low CFM exhaust fan to help draw the steam? I'm hoping the steam will just flow on its own. Any thoughts?

[maple flats]

While straight up is best, a 45 degree incline might work for a steam stack, but you may want to increase the diameter, enlarge it 20% or add an inducer, whichever costs less. Steam stacks can be light gauge, If you get it set up before the season, soon enough to test it, I suggest running a test just boiling potable water without enlarging it to test.
On my old 3x8 I had a full hood but with a devider between the 3x3 syrup pan and the 3x5 flues pan. I had 2 steam stacks, both 15". The stack on the syrup pan had 2 45 ells, to side step a joist, the other had a preheater in the hood and a lockable damper to hold steam in to just before steam started leaking out at seams where the hood sat on the evaporator, or thru the 4 doors in the hood. That damper was locked at about 45 degrees closed, but that stack went straight up, no offset. It worked fine, so much so that I often thought the stacks would have been good at 12" each. I'll never know, I sold that evaporator complete as I downsized. I'm now setting up a 2x6 oil fired for the 2026 season. Having gone from over 1300 taps down to under 500.