Well, I’ve got an electric oven with a partially blocked vent (movers dropped it). I think I’ll swing by my old college lab and borrow some ethanol.
I’ll post the results here. 
One question MixieArmadillo: What’s your elevation above sea level? Ambient pressure could affect the results - I’m at about 5600 feet.
Hell, as long as it won’t hurt the oven, I’m all for kitchen pyrotechnics. Must add “fire extinguisher” to the Christmas list, though. And remember to duck next time.
Those were damn good apples.
And you’re welcome to post my unwise and/or unwitting oven experiements 
Disclaimer: The OP is not responsible for any heinous injuries caused by experimentally minded Dopers in the recreation of the Great Oven Infernotm
Be sure to take pictures
I’m in Eugene, Oregon, haven’t a clue what the elevation is. Higher than sea level, presumably, 'cause we’ve got them thar big hilly thangs right o’er yonder.
Yes, if the oven is clean, I’d go with a blocked vent. (I understand people not cleaning their ovens. When I was rowing up, my parents seem to never have heard of cleaning an oven. Well, they cleaned the ovens on their rental properties, but I don’t think they have cleaned their own five times in 40+ years of marriage. I actually run the self-clean-cycle myself if I’m there on a nice day when I can run the attic fan, because they claim they don’t know how, despite the unstructions I’ve permanently mounted on the fridge)
A previous tenant may have used aluminum foil to line the stove burner pans. I’ve seen tenants who’ve never bought a stove (and therefore never seen a manual) seal an oven vent because they didn’t understand what they were. Landlords may not notice.
If there is proper ventilation (as the oven was designed), I wouldn’t worry about cooking with alcohol. I’ve certainly never had an issue with it, and I’ve served many a flambe’ without incident. Find what’s wrong with your oven venting, and worry no more.
How do you figure that?
Assume room temperature = 60 degrees F (288 Kelvin).
288 K * 1.6 = 460 K = 368 degrees F