Industrial Downdraft Ventilation System for Aluminum Anodizing, Coloring &

ME-AL Downdraft System is a matched front-end exhaust collection device independently developed for full-process aluminum alloy surface treatment workshops, perfectly compatible with automatic/manual/vertical anodizing lines, coloring tanks and electrophoresis production lines.

In oxidation, coloring and sealing processes, tanks continuously release corrosive acid mist, alkali vapor and toxic waste gas. Without efficient enclosed air extraction, the mist will corrode workshop steel structures, damage electrical control cabinets, harm operator health and fail local environmental emission standards.

Our downdraft system forms negative pressure air suction above each process tank via customized air hoods, completely trapping volatile acid & alkali fumes, then delivers collected waste gas to three-acid acid mist treatment systems for spray purification, ensuring clean workshop air and qualified exhaust discharge.

The full set downdraft ventilation solution consists of modular standardized components for easy assembly and maintenance:

1. Mist Collection Air Hoods
   Custom size matching oxidation/coloring tanks, fully cover liquid surface to prevent gas overflow; anti-corrosion PP/UPVC material resistant to strong acid and alkali.
2. Exhaust Gas Conveying Pipeline
   UPVC corrosion-resistant pipes & matched valves, smooth inner wall reduces wind resistance, avoids liquid backflow.
3. High-Pressure Air Boosting Fan
   Supporting three-blade Roots blower with stable air volume, low noise, long service life under corrosive gas environment.
4. Connection Fittings & Auxiliary Parts
   Full range of corrosion-resistant pipe joints, adjustable air dampers for independent air volume control of single tank.

1. Negative pressure generated by booster fan creates air suction on the top of process tanks
2. Acid mist and alkali vapor are fully enclosed and captured by air hoods
3. Waste gas flows through UPVC pipeline to the secondary acid mist washing tower
4. Waste gas undergoes two-stage chemical spray absorption and gravity demisting
5. Purified clean gas is discharged up to standard through high exhaust chimney

All gas-contact parts adopt UPVC and PP corrosion-resistant materials, resisting long-term erosion of sulfuric acid, mixed acid and alkaline liquid; no rust, no aging, longer service life than metal ventilation pipelines.

Custom air hood design fits tank size precisely, forms stable negative pressure area above liquid surface, eliminates mist overflow, protects workshop equipment and staff respiratory health.

Matched low-loss Roots blower, optimized pipeline layout to cut wind resistance; adjustable air volume dampers realize independent air supply for single or multiple tanks, reduce unnecessary power consumption.

Seamless linkage with ME-AL three-acid acid mist treatment system, supporting automatic linkage with production line central control system; remote monitoring of fan running status available.

Modular split design, convenient on-site splicing; smooth pipeline reduces impurity adhesion, easy regular cleaning, fewer downtime losses.

Fully capture acid & alkali waste gas, support subsequent two-stage spray purification, ensure exhaust gas meets domestic and Southeast Asia industrial waste emission standards, avoid environmental inspection penalties.

• Automatic / Vertical / Manual / Mini aluminum anodizing production lines
• Electrolytic coloring tank, electrophoresis rinsing tank, sealing tank workshop
• Three-acid mixed acid mist waste gas treatment stations
• Architectural aluminum profile factories, industrial aluminum extrusion processing plants
• Metal surface treatment integrated workshops with oxidation, coloring and electrophoresis processes