Kostrzewa Mini Matic Notice Technique page 43

9. Maintenance
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Fig. Disconnecting the burner cables
9.3. Opening/closing the burner doors
The boiler doors are left-handed (can be installed as right-handed) and are an integral part of Platinum Bio Matic burner.
Fig. Removing the burner star knobs
Mini Matic User Manual – EN 03.21
Heating and ventilation