Interfab Electronics [I] Pvt. Ltd. Supplies Relative Humidity - RH Controlled Dehumidifiers. Interfab Electronics [I] Pvt. Ltd. Is an ISO 9001:2000 accredited company that manufactures PCB Assemblies, Printed Circuit Board Assemblies, Hybrid Micro Circuits, Surface Mount Technology [SMT], etc. The Relative Humidity - RH Controlled Dehumidifiers are household appliances that reduces the level of humidity in the air, usually for health reasons, as humid air can cause mould and mildew to grow inside homes, which has various health risks. Relative humidity is preferably 30 to 50%. The Relative Humidity - RH Controlled Dehumidifiers are used in industrial climatic chambers for keeping certain level of humidity.