Look up the make and model of stove and find out the distance to combustables this must be adhered to. Also make sure u fit some sort of a heart stone this must have 225mm distance infront of the stove this is the reg. Don't fit any long horizontal pipes as it won't work and it's a sute trap it will build up on a 90 degree bend also its against the rules to go more than 150mm horizontally. Use 45 degrees instead. Ideally for best results come out the top of the stove u can use single wall pipe at the start but if there are any combustables materials near (single wall requires 3x the diameter of the pipe ie 6" pipe 18" clearence required) switch to twin wall and ether go through the roof of 45 degrees out the wall. Remember the higher the flue the better the draw so go as high as u can. If you need any help just ask