... Corrosion-resistant galvanized steel 3. Changable velcro pre-filter Ventilation Accessaries, Carbon Filter 4'' 6'' 8'' 10'' 12'' Available ·Technical Parameters ... to test them. We supply hydroponic equipment including grow tents, reflectors (air cooled, cool tube, adjust ... (flexible duct inline fans, etc), grow bulbs (including HPS and MH), grow ballasts (magnetic and electronic), reflective materials ...