The A4 Paper Test - Beech ovens REC Series Installation And Operation Manual

Beech Ovens Page 70 28/07/2011 (C)
RND-REC-RGO Manual (R1) Confidential and Proprietary

The A4 Paper Test

Without access to suitable measuring equipment, the most effective method to correctly
calibrate the oven exhaust is using the A4 Paper Test as explained below.
The A4 paper test has been developed to be a simple and effective gauge to determine
the draw (suction) at the oven exhaust spigot (top of the oven mouth). This is a common
and often overlooked cause of poor oven performance.
Too much suction causes the oven to lose heat & use excessive fuel. Too little suction
allows smoke and combustion gas to escape into the kitchen. There is a fine balance
between too much and too little. To adjust the draw, you will need to access the System
Damper quadrant adjuster installed in the Flue transition or Spray Filter connected to
the oven spigot.
Too much draw (suction) Not enough draw (suction)
For Australian installations using the Interlock System (AS5601) the Flue
temperature can be adjusted using the System Damper to achieve a PV (Interlock)
of 130°C -150°C (max) when the oven is fully heated.
For all other systems, it is advisable to check the exhaust spigot temperature
when the oven is fully heated and operational. Adjust the damper to obtain 130°C
-150°C.