This is a replacement of the outside air adapter kit for many of the Jotul wood and coal stoves but may fit on other manufacturers 

Measurements: 8 3/4" x 5 1/8"

This adapter must be used with the rear heatshield listed below

Jotul F602 use Part # HS-50 (rear heatshield)
Jotul F118CB use Part # 320098 (rear heatshield)