I’m unsure about this roof penetration. The pipe in photo is from an 90% AFUE furnace. Is it too close to the window?
Hi Darius, you need more information to make that determination such as Btuh, distance from window, manufacturer and their recommendations. There was a previous thread on this which included a link to some great information from Inspectapedia:
Furnace Vent Pipe Clearance - Specific Inspection Topics / Inspecting HVAC Systems - InterNACHI®️ Forum
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Installation instructions should provide clearance information.
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What Dave said.
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Thanks for clarifying.
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What David and Dave said…
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Gas Appliance Direct Vent Clearances
Distances from direct gas vent to building features
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How close is it?
In the past I’ve been surprised how close gas appliance terminations are permitted to be to opening windows. Years ago before I knew the game of looking up the manf. instructions I called out a new build with a large gas fireplace termination less than a foot from a bedroom window. The builder called me an idiot and I suppose he was technically right but I still think it was just dumb. I probably could have also called it out as a egress concern it was so close. I took a class once that was part of the curriculum to become an AHJ inspector and the teacher was a character… just kept repeating, “Folks, the code doesn’t address stupid.” 
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Is it an operable window? I don’t see a crank.
My thoughts as well. Is this a fixed window or a casement window?
Or a slider??
Exactly what I was looking for! Appreciate it
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I always note gas appliances exhaust and location to windows/openings when in question.
But my own head scratcher question regarding a furnace exhaust, is why would anyone have their window open for a period of time while it’s cold enough to run the furnace?
I know, I know…there are a lot of idiots out there so we do need to CYA’s. 
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My pleasure.
Not a pipe, but a flue pipe or exhaust flue pipe. The purpose of the flue pipe, to remove harmful byproducts of the combusted, or burned, fuel from inside your home.
Remember there are intake flue pipes as well.
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That’s the single most smartest thing I’ve ever seen you post on this MB, Thank you Tom.
Here in MN, in the twin cities with low efficiency homes with gas burning forced air appliances I regularly see 2nd floor windows open while the furnace is running in temperatures in the teens. So it does happen. Sure its a waste of money.
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(Not targeting Brandon)…
Some people don’t give a shit about that. Their comfort is a greater priority.
You think someone living in Minnesota honestly gives a crap about a few degrees temperature?
Ever wonder why old homes are so popular, and not just for their ‘personality’?
They breath!
Have you never cracked open your car window while driving in Winter? Why?
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That flue termination requires a cap. Rain and rodents can enter as well as a tennis ball block the flue.
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Who is going to go up on the snow-covered roof to remove the giant chunk of ice when it locks out the furnace?
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