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Hi Frankiee, Never run any type of vent at 90º. Why? On wood stoves it would allow ash to collect in the low point of the stack. Lye can be made from wood ash. You put down news paper in a "V" box then add wood ash then add water and then leach the lye water off. Evaporate the water to make lye crystals. Lye is a very corrosive chemmical that will eat most metals. All vents make condensastion as they vent gass. That is your water source. In other fuel type vents we can make other chemicals from the same process. 2) As the vent direction is turned towards horizontal the natural draw thru the vent slows the volicity of the gas. Depending on the vent usage, one could expect turblent flow inside the stack. The more tuberlant the flow is, the less gas that is exhausted. Adjustable 90º EL's are they way to go as you can make a infinite number of angles by adjusting the elbows. You may/will also need a short piece of straight pipe. Be careful while getting the elbows to pre-fit adjusted as if you hit a snag and twist them too far/hard they can/will snap apart. They will go back together with patients. There put together like a big screw. At each seam you bend one out and one in at the 180º points, screw together then set the turnout flat with a hammer and dolly. On a wood stove (this excludes any other fuel type) the connection is the upper connection always slips inside the lower connection. This keeps the liquid cerosote inside the stack to return to the fire box and not leak out at the joints. Cerosote is highly flamable and in fact can be used to make turpintine as most pitch can be used. All joints must have no less than three screws attaching the joints together. After installing/changing any vent, take a small piece of news paper and set it on fire to check the new vent for proper draw. If it checks well use a larger piece and with a final rolled up full sheet. Pay attention to each connection joint for leakage. Don't mistake a cold stack draw for a vent problem. All vents must extend 2ft above anything 10ft horizontal away on the roof. This keeps the vent from sucking a back draft or reversing stack gas flow. Any vent penetration thru another wall/roof requires a thimbil made to code. Most fires that burn down homes start at this joint so don't cheat the thimbil man. There's a whole bunch of codes between the thimbil and roof penetration that can NOT be covered here. There's not one code that you can skimp on. Watch your wood stove and stack clearance to combustables. Every stove is different. T_Bone
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