CHAPTER 5
Instructions, use and maintenance manual
D r a g o P 1
Page 45
5.6.4. FLUE
In order to guarantee flue evacuation, the cooking oven must be equipped with a flue as a continuation of the
chimney to the ceiling, which must extend about 50 cm from the top.
The flue diameter cannot be smaller than the chimney outlet diameter.
CAUTION!
Prior to the installation, always carry out the development calculations needed for proper sizing
of the flue.
The minimum recommended height of the flue exiting the chimney is at least 3 m vertically, in order to ensure
sufficient draught and proper fume evacuation.
CAUTION!
Insufficient draught of the flue may lead to burner malfunctions, such as irregular operation and
incorrect heat distribution inside the cooking oven.
AVANZINI BRUCIATORI s.r.l. is relieved of any and all responsibility with regards to breakdowns
caused by improper sizing or by incorrect installation of the flue.
In case the flue need to run horizontally in some sections, increase its length by 2 vertical metres for each
horizontal metre.
For better burner operation AVANZINI BRUCIATORI s.r.l. recommends the installation of a draught regulator, in
order to regulate the amount of heat to vent from the oven through the negative pressure of the chimney.
The draught regulator can be positioned at the exit of the oven chimney or, alternatively, in the first section of the
flue exiting the chimney.
CAUTION!
The proper negative pressure measured at the oven door must be equal to - 0.1 mm H
2
O (negative
pressure).
Operate the draught regulator, where present, until the proper value is reached.
The draught pressure can be measured at the oven loading door using a draught gauge, and by manually
operating the regulator until the desired value is obtained.
In case a draught gauge suited to the measure to be carried out is not available, carry out the following procedure
for the adjustment:
STEP
ACTION
1
Close the draught regulator gate until you can perceive the slightly pungent smell unburnt gases
when standing in front of the oven loading door.
2
Gradually open the draught regulator gate until you no longer smell the gases and the heat that
comes out of the oven loading door is acceptable when you place your hand near the upper refractory
portion of the door.
