Napoleon Ascent Linear Premium Serie Manuel D'installation page 23

venting requirements
EN
3.8 vent shield installation
#1 x 2
A. Form vent shield to a 90° angle (as illustrated in installation step above).
B. Install the vent shield by securing it to top of appliance using 2 screws (supplied).
C. Adjust vent shield top to suit horizontal run.
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W415-4038 / A / 01.31.23