Efel wood stove in basement not drawing air to exhaust.

I am using a basement window for my piping. I put a tee at the back of stove, 5ft of pipe to elbow out the window. There is another 3ft section going straight out to another tee. From that tee i have a total of 15ft of pipe going up to cap. I am 4ft above the eve of roof. I have a existing fireplace in basement it draws with no problem. I have tried closing the damper in the fireplace but new stove still will not draw. Please help. Thank you michael