Northfire 3400
11
VENTING INSTRUCTIONS
Maintain a minimum of 1” clearance to combus-
tibles on sides and bottom and 2” from top sur-
face of the vent. The gas fireplace is designed
and optimized for majority of the installations
with short vents. With taller vents, the effi-
ciency and flame characteristics will change.
Therefore, an exhaust restrictor plate is provided
by the manufacturer to preserve as much of the
original short vent performances as possible on
taller vent configurations.
Top/Rear Vent Units
Rear Vent Units
Maximum Horizontal run for Rear Vent is 36” from the back of the unit to termination or 16”
with a 45º elbow
Follow the venting instructions as strictly as possible to obtain the best
performance from the appliance.
**Top/Rear Conversion Instructions Pg. 30**