How to choose the appropriate double-opening air shower according to actual needs

When choosing a double-opening air shower, a comprehensive consideration should be made from multiple dimensions such as industry demands, goods characteristics, cleanliness standards, and space conditions. The following is a systematic selection guide to help users accurately match their actual needs:
First, clarify the core application scenarios and industry requirements
Industry characteristic matching
Key points for selecting the critical demands of industry types
High cleanliness level for electronics/semiconductors (ISO 5-6 grade), high-frequency material transfer (such as wafer boxes, PCB boards), and anti-static design. Stainless steel inner wall (304/316L), wind speed ≥25m/s, ionic wind and function.
Food/medical and health grade design (easy to clean, no dead corners), anti-corrosion, in compliance with GMP/HACCP standards, and explosion-proof function may be required. Arc-shaped door frame, food-grade stainless steel, ultraviolet sterilization lamp, explosion-proof motor.
Chemical/spraying anti-corrosion and explosion-proof performance (for solvent evaporation scenarios), large-sized cargo channels (such as equipment component transportation). Explosion-proof control system, inner wall made of PP/PE material, large door size (≥1.5m×2m).
Logistics and warehousing feature high throughput and fast passage (such as batch transfer of palletized goods), while also providing dust-proof effects. Double-door interlocking speed ≥0.5m/s, automatic sensing system, large space design (internal depth ≥2.5m).
2. Cleanliness grade positioning
ISO Level 5 (Class 100) : It is required to be equipped with a HEPA high-efficiency filter (filtration efficiency ≥99.97%@0.3μm), a shower time ≥30 seconds, and a wind speed ≥28m/s. It is suitable for scenarios such as semiconductor wafers and medical devices.
ISO 7-8 grade (Class 10,000-100,000): A combination of primary efficiency + medium efficiency + sub-high efficiency filtration can be used. The air shower time is 15-20 seconds, suitable for scenarios such as food packaging and common electronic components.
Ii. Analysis of Goods Parameters and Logistics Demands
1. Dimensions and weight of the goods
Key measurement data: Maximum length, width, and height of the goods (such as pallet size 1.2m×1.0m×1.5m), single piece weight (the bottom plate needs to be reinforced if it exceeds 500kg).
Space reservation principle: The internal dimensions of the cargo shower = the maximum size of the goods + 30-50cm (reserving operation space on one side). For example, if the size of the goods is 1.5m×1.0m×2.0m, it is recommended to choose the model with an internal size of 2.0m×1.5m×2.5m.
2. Throughput and circulation efficiency
Calculate the number of batches required per hour: According to the production line rhythm, if 80 batches of goods need to be processed per hour, a model with a double door opening speed of ≥0.4m/s and an air shower time of ≤20 seconds should be selected (reference formula: Batch/hour = 3600 seconds ÷ (Door opening time + air shower time + door closing time)).
Continuous operation design: For high-frequency scenarios (such as electronics factories), it is recommended to choose models with PLC cache programs, which support continuous sensing and triggering of multiple batches of goods to avoid waiting.
3. Special cargo handling
Dust-prone goods: For powdered raw materials, the airflow rate should be increased to over 35m/s, and a dust collection drawer should be set up at the bottom.
Flammable and explosive goods: In the chemical industry, explosion-proof fans (Ex d IIC T6 certification) and anti-static grounding devices should be selected to avoid static sparks.
Iii. Guide for Selecting Core Parameters of Equipment
1. Air shower system configuration
Fan power and air volume:
For regular scenarios: A 10-15㎡ air shower room can be equipped with 2×0.75kW fans, with an air volume of 3000-4000m³/h.
For large items: In Spaces over 20 square meters, it is recommended to use dual fans (2×1.5kW) with an air volume of ≥6000m³/h to ensure uniform air velocity coverage.
Nozzle layout:
Standard configuration: 12-16 nozzles on both sides and the top (rotary nozzles provide more uniform coverage); For large items, bottom nozzles need to be added (to prevent dust accumulation on the pallets).
2. Filtration system grade
Filter level, filter type, applicable cleanliness grade, replacement cycle
The primary filter is pre-filtered with G4 grade non-woven fabric, protecting the medium-efficiency filter element for 3 to 6 months
Medium-efficiency F8 grade bag filter can filter 1-5μm particles for 6-12 months
High-efficiency filtration (core) H13 grade HEPA ISO 5-7 grade 12-18 months
Ultra-efficient filtration of U15 grade ULPA ISO 4-5 grade (semiconductor) for 18-24 months
3. Door body and Control mode
Door body material:
Conventional scenario: 304 stainless steel (thickness ≥1.2mm); In damp environments (such as food workshops), 316L stainless steel is required for anti-corrosion.
Control mode:
Basic type: Infrared sensing + manual button, suitable for medium and small batch use;
Intelligent type: PLC programmable control + touch screen, supporting automatic adjustment of air shower time and fault early warning (such as filter pressure difference alarm), suitable for automated production lines.
Four. Compatibility of space with installation conditions
On-site space planning
Installation size requirements: 50-80cm of maintenance space should be reserved outside the air shower enclosure (especially on the fan side), and 30cm of height should be reserved at the top for filter replacement.
Channel connection: The entrance and exit of the goods shower room should be aligned with the conveyor belt and AGV track, with an error of no more than 5cm, to ensure the smooth entry and exit of goods.
2. Energy consumption and installation costs
Power reference: The standard model (15㎡) has an overall power of approximately 3 to 5kW, while the inverter model (energy-saving by 20%) has a power of 4 to 6kW, but the initial cost is 15% to 20% higher.
Installation method:
Prefabricated: On-site assembly, suitable for space-constrained scenarios (such as workshop renovation);
Integral type: Pre-installed in the factory, directly hoisted, with fast installation speed (1-2 days), but the doorway must be ≥2.5m×2.5m.
V. Additional Functions and Customized Requirements
Optional value-added configuration
Sterilization module: Ultraviolet lamp (wavelength 254nm), ozone generator (suitable for pharmaceutical workshops, sterilization efficiency ≥99%).
Anti-static design: Anti-static rubber sheets are attached to the inner walls (with a surface resistance of 10^6-10^9Ω), and conductive rubber pads are laid on the floor to prevent static damage to electronic components.
Data recording: Equipped with an RS485 interface, it can upload data such as air shower time and filter pressure difference in real time, meeting GMP traceability requirements.
2. Customization for special scenarios
Low-temperature environment: In areas with temperatures below -10℃, an electric heating device (preheating the fan inlet) should be installed to prevent the filter from frosting.
In high-humidity scenarios: In humid areas of the south, moisture-proof heaters should be installed in the control cabinet to prevent short circuits in the circuit.
Vi. Selection Process and Pitfall Avoidance Guide
Step-by-step selection process:
① Determine the cleanliness level of the industry →② Measure the size of the goods →③ Calculate the hourly throughput →④ Match the internal dimensions of the equipment →⑤ Select the fan/filter configuration →⑥ Customize additional functions.
Key points to avoid pitfalls:
Avoid "one-size-fits-all" selection: For instance, in food workshops, do not choose ordinary stainless steel (food-grade certification is required);
Beware of low-price traps: Equipment priced 30% lower than the market average may use inferior filters (such as passing off H11 grade as H13 grade), resulting in substandard cleanliness.
Confirm the after-sales terms: filter replacement cycle, fan warranty period (at least 2 years), emergency repair response time (≤24 hours).
Vii. Reference of Typical Selection Cases
Case 1: Semiconductor Wafer Workshop
Requirements: ISO grade 5 cleanliness, processing 300mm wafer boxes (dimensions 320mm×320mm×250mm), 60 batches per hour.
Selection: Internal dimensions 1800mm×1500mm×2000mm, 316L stainless steel inner wall, H13 grade HEPA filter, dual fans (1.1kW×2), wind speed 30m/s, equipped with ion fans to neutralize static electricity.
Case 2: Cold Chain Food Factory
Requirements: ISO grade 7 cleanliness, palletized goods (1.1m×1.1m×1.8m), 40 batches per hour, workshop temperature 5℃.
Selection: Internal dimensions 2500mm×2000mm×2200mm, 304 stainless steel + electric heating fan (preheated to 15℃), arc corner door frame (easy to clean), ultraviolet sterilization lamp, explosion-proof control switch.
Through a comprehensive assessment of the above dimensions, it can be ensured that the double-opening cargo shower room not only meets the cleanliness requirements but also maximizes the adaptation to the efficiency of cargo circulation and on-site conditions, avoiding the cost of later renovation.