180-AF25 v1.11 per PE32 revs
March 15, 2021
Page 14
AF25
INSTALLATION INSTRUCTIONS
COMBUSTION AIR
Ensure adequate combustion air allowing for all other exhausting type appliances in the dwelling (range hoods,
dryers, etc.). In air tight homes and modern constructions, careful considerations must be taken into account
when using a wood burning appliance. Heat recovery ventilators (HRV) systems along with constant running
fan motors in air handlers must be taken into account when balancing the system. Failure to do so may
result in air starvation, smoke spillage and carbon monoxide threats. Consult a HVAC specialist for proper
installation. Ensure adequate combustion air allowing for all other exhausting type appliances in the dwelling
(range hoods, dryers, etc.). In airtight houses it is recommended to install a fresh air inlet into the room where
the appliance is located, to prevent air starvation.
ROLE OF THE CHIMNEY
Without a proper installed chimney, this appliance will not burn correctly.
The role of the chimney is to pull the proper amount of air into the firebox for the purpose of complete
combustion. Incomplete combustion will lead to more smoke and pollution of the outside air. A proper
operating chimney will allow the user to enjoy peak performance at all burn operating levels from low to high.
Blaze King therefore recommends vertical installations with a minimum length of 15’ from appliance top to
chimney cap. In insert applications Blaze King recommends insulated liners into all existing chimneys.
DRAFTING PERFORMANCE
Draft is the force which moves air into the appliance up through the chimney. The amount of draft created by
your chimney depends upon length, offsets, insulating properties, obstructions (such as architectural design,
trees), local geography and other factors.
External forces, such as outdoor temperature, wind, barometric pressure, topography, or factors inside the
home (negative pressure from exhaust fans, chimneys, air infiltration, etc) may adversely affect draft.
Too much draft may cause excessive temperatures in the appliance and may damage the heater. An
uncontrollable burn or excessive temperature indicates excessive draft.
Inadequate draft may cause back puffing (spillage) into the room and plugging of the chimney, chimney cap or
spark arrestor screen. Inadequate draft may cause smoke to leak into the room through appliance or chimney
connector joints. Poor draft can also lead to poor heat production and the inability for the combustor to remain
active in lower burn rate settings.
High efficiency appliances, such as your Blaze King stove, may require some fine tuning of your chimney
system in order to maximize performance.
Blaze King cannot be responsible for external forces leading to less than optimal performance.
