Drolet ESCAPE 1800 Installation And Operation Manual page 42

Note that secondary air tubes (B), (C), (D) and (E) can be replaced without removing the baffle board (A).
The air tubes are identified for placement as follows:
Page 42
Important Notes
(B) Front :
(C) Middle front:
(D) Middle rear:
(E) Rear:
30 holes of 3.75 mm
30 holes of 3.50 mm
20 holes of 3.25 mm
15 holes of 3.25 mm
Installation and Operation Manual - Escape 1800