Answer to Question #25217 in Molecular Physics | Thermodynamics for graham

Question

A wood burning stove requires 12 Pascal’s to run at its ideal capacity.
The stove is a cube with an internal plate that is set to allow fumes out of the stove and up the chimney.
This is set to give the required efficiency of about 80%.
At 12 Pascal’s this is achieved.
Now my question
If the flue draughts initial reading is 8 Pascal’s and the plate is reduced in size to achieve 12 Pascal's, do you lose efficiency by allowing more of the smoke and heat to pass into the chimney, or would it remain the same, as your still achieving 12pa.