identifying a specific vent-pipe on my roof

[MIKEMCD77]

My house was built in the 1960s, and the roof vents have probably never been cleaned out. So I'm getting ready to clean them all out, and have read the procedure for doing that. However, I don't want to spray water down any vents that I shouldn't (i.e., those not related to water usage, such as the furnace). There's one vent that I'm not sure what it's for. It's located close to my cooking stove. Do cooking stoves always have a roof vent, even if it's an electric stove? Again, my house (in Colonial Heights, VA) was built in the 1960s. I've lived here for the past 35 years, and I've always had an electric stove. (I don't know whether there was a gas stove prior to that.) The pipe is a little taller and a little larger diameter than those for the sinks (and has a mushroom cap on it).

 

[colinnwn]

Electric stoves don't have vents on the roof. I've never seen a gas stove that did for that matter. Drain vents never have caps (at least in my area) because they run straight to your drain. For that year of house, a drain vent should be a cast iron pipe that has a lead covering called a pipe jack

https://www.google.com/search?q=lead+pipe+jack

A combustion or air vent for the house is generally a thin sheet metal vent with a cover. Given the area of your house and description, I'd guess it could be the vent for your range hood. Other possibilities are your dryer vent or gas water heater vent, or as you said the furnace. Do you not have access to the attic so you could verify what it is connected to?

 

[MIKEMCD77]

Thanks very much for the helpful information!! My attic is not one that can be walked around in, and the pipe in question is far away from the attic opening. Anyway, you have given clear, articulate, and helpful answers!