To guarantee safety, the hardware components, must be the subject of maintenance at least once per year to check for stability and wear. According to requirements,
the fixing screws must be tightened and/or a number of parts must be adjusted. In addition, the following maintenance operations must be carried out at least once per year:

• All hardware moving parts and blocking points must be lubricated
• Do not use aggressive detergents, alcohol or other chemical products which might corrode the surfaces during cleaning, and which might damage the anti- corrosion protection of the hardware components;
• The hardware adjustment work, as well as any substitution of parts must be carried out by a specialized company;

1. PRESERVATION OF THE SURFACE FINISH
   Electrolytically applied zinc coatings are not subject to attack in a room under normal climatic conditions, as long as condensation is not formed on the hardware,
   or if it is dried rapidly. In order permanently to preserve the quality of the hardware surface, and to avoid deterioration through corrosion, the following points must be complied with:
   • The attachment and/or sliding areas must be sufficiently ventilated, in particular during the construction phase, in order to avoid their being exposed to direct humidity or condensation. In all cases, measures should be adopted to avoid humidity condensing permanently in the sliding areas.
   • The hardware must be kept devoid of deposits and dirt from construction materials (powders, plaster, cement, etc.). Any residues of plaster, mortar or similar materials, must be removed with water and then dried.
   • Aggressive vapours (for example, formic or acetic acids, ammonia, amines, aldehydes, phenols, chlorides, tannic acid, etc.) in connection with small formations of condensation, which might provoke rapid corrosion of the fixings. For this reason, the evaporation of these substances in the vicinity of these windows must absolutely be avoided.
   • Furthermore, acid or acetic acid sealing compounds, or those with the above-mentioned contents may not be used, given that both direct contact with the sealing compound or with its vapour may attack the surface of the fittings.
   • The fittings may only be cleaned with gentle detergents with a neutral pH, in diluted form. Under no circumstances may aggressive detergents be used, nor acids or abrasive detergents whose contents include those listed in the preceding paragraph.
   • This Guarantee is not applicable in the event of defects occasioned following damage by fire or other accidental events, the use of abrasive brushes and/ or products, incorrect installation, acts of vandalism and, in any case, incorrect use.
   • With reference to part completed and/or unpainted products, MASTER declines any responsibility for any anomalies which should occur following production and/or modification processes on the product itself, carried out by third parties after consignment by MASTER.