Flue Pressure Adjustment
The flue creates the negative air pressure within the stove which draws the air into the burner. For the correct
operation of the burner this air flow must be proportioned to the firing rate of the burner.
The chart illustrates the required negative air pressures relative to the burner settings, with the shaded band giving
the tolerance within which the burner will give satisfactory performance. The stoves are equipped with pressure test
points which will give the actual pressure within the stove, but it is not possible to verify the pressures to enable the
correct adjustment of the draught stabilizer without a suitable manometer. The pressure must be tested within the
stove as flue draught readings taken in the flue, are after the stoves stabiliser, and will give an incorrect reading.
We recommend the Dwyer 460 Air Meter is used when taking flue draught readings as it is small, light and easy to use.
Draught Requirements Belfort and Savoy
Maximum
0.065 inches WG / 15 Pa
0.035 inches WG / 8 Pa
Minimum
Note: This is not a water gauge
used to measure gas pressure.
Possible smoke and
soot formation in
these areas
Inches water gauge
