The Heavy Duty Air Curtains forms an efficient air barrier to prevent air, dust, flies, insect from entering a particular area even though the doors and fully open & vice-versa for preventing air conditioned air from escaping. Pullman Engineering Systems Pvt. Ltd. Manufactures Heavy Duty Air Curtains. Pullman Engineering Systems Pvt. Ltd. Supplies ventilation and pressurisation systems, dust collections systems, fume extraction systems, pneumatic conveying systems, etc. These Heavy Duty Air Curtains are available for door width 3`, 3.5`, 4`, 5` & for bigger door width multiple air curtains are fitted on the doors.