I'm a newbie at this so sorry if I'm posting in the wrong place. I just installed an Englander pellet stove in my basement and I think I may have received bad advice from Home Depot. This is what I have: (on inside) a Tee in the back of the stove, 3 ft vertical pipe, 90 elbow, 1ft horizontal through window that a replaced glass with sheet metal, (outside) another tee with 3 ft vertical and a vertical cap. The guy a Home Depot told me to use a vertical cap so I did not have to add another elbow. But the cap is only like 3 inches from my vinyl siding which I think is too close. If I remove the cap and put another elbow on with a horizontal cap do I have too many albows and will I have to go to 4 inch pipe? Someone told me that the last elbow doesn't count. Is that true. Thanks for the help.