... Corrosion-resistant galvanized steel 3. Changable velcro pre-filter Ventilation Accessaries, Carbon Filter 4'' 6'' 8'' 10'' 12'' Available ... Parameters:* Corrosion-resistant galvanized steel* Changeable velcro pre-filter* High grade activated charcoal* Over boxed in corrugated ... . We supply hydroponic equipment including grow tents, reflectors (air cooled, cool tube, adjust a wing, etc.), ventilation ...