Ressort de registre d'air SL 400 - 420, SGN 400 - 420

Air damper spring SL 400-420, SGN 400-420 is used in burners of these series to ensure correct operation of the air adjustment mechanism. This part creates the necessary force to move the damper and lock it in the required position. Made of spring steel that withstands repeated compression-extension cycles. When the spring is worn or broken, the accuracy of air dosing is disrupted, affecting combustion efficiency. Replacement with an original component restores normal burner operation. Recommended for professional repair of heating equipment.