Duroplast Extrusion Pvt. Ltd. Offers PVC Prefab Shelter. Duroplast Extrusion Pvt. Ltd. Manufactures PVC hollow profiles for windows, doors, partition, wall panelling, false ceiling, etc. The PVC Prefab Shelter is suitable for school, garden house, rest house, site, security booth, construction site office etc. In different size [from 3 ft, x 3 ft to 40 ft. X 40 ft.].