RZ3/4
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RZ3/4 Hold-open system VdS tested and approved by the building authority Product description The DIBt building rules list requires proof of applicability for fire protection closures (a German technical approval from the building authority or a European technical approval). These approvals stipulate a hold-open system to keep the systems open during operation. The hold-open system must be suited for this task. It applicability must be verified by means of a technical approval. Control unit Fire alarm analysis Push-button • Via fire alarm loop or smoke switch • Potential-free contact of fire alarm centre

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