Napoleon Ascent 42 B42NTR Installation And Operation Manual page 28

rough framing
EN
MAXIMUM REAR VENT CLEARANCES (EXAMPLE 1)
For rear vent termination exceeding 10" (254mm).
REAR EXIT ENCLOSURE
The appliance requires a minimum enclosure height of 41 5/8" (105.7cm). For temperature requirements, the
enclosure space around and above the appliance must be left unobstructed.
* See "venting" section.
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W415-1293 / J / 03.11.19