OVE 4 explosion-proof electric heaters are designed for heating rooms where dust or combustible gases and vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures. The type of protection is ‘flameproof enclosure’ in accordance with GOST 22782.6-84. All products have explosion protection marking IExdIIAT3 in accordance with GOST 12.2.020-76. The type of climatic modification is UHL3 (UHL – temperate and cold climate, +40/-60o C; 3 – for enclosed spaces without artificially controlled climatic conditions) according to GOST 15150-69.