Stainless Steel Clean Laminar Flow Hood: High Cleanliness Solutions from China Suppliers and Factory
Widely used in electronics, biology, medicine, food, precision instruments and other industries of dust-free aseptic operating environment. Provides local high cleanliness working environment.
Typically made of sprayed cold-rolled steel plate or stainless steel (SUS304, SUS316), known for high strength, corrosion resistance, and ease of cleaning.
Corners often feature rounded transitions to avoid dead angles, facilitating cleaning and preventing dust accumulation.
The "heart" of the laminar flow cabinet, providing the power for air circulation. Typically located at the top of the unit (fan on top, referred to as a "top-mounted fan" structure).
Usually employs high-efficiency, low-noise backward-curved centrifugal fans, capable of providing stable and adequate static pressure and airflow.
Often an EC Motor (Electronically Commutated Motor), enabling stepless speed control, offering energy savings and precise control.
This is the most critical part, determining the cleanliness effectiveness.
Location: Positioned near the fan intake.
Function: Filters larger airborne particles (e.g., dust, fibers) to protect the subsequent HEPA filter and extend its service life.
Material: Typically non-woven fabric or nylon mesh, which can be washed or replaced.
Location: Located at the bottom of the enclosure, facing the work area directly.
Function: Filters out particles ≥0.3µm with an efficiency of up to 99.99%. Ensures the discharged air is clean and sterile.
Installation: Requires specialized sealing structures (e.g., liquid trough seal, mechanical clamping with gaskets) to ensure no leakage.
Location: Same as the HEPA filter.
Function: Used for applications requiring higher standards, with a filtration efficiency of ≥99.999% for particles ≥0.12µm.
Located above the HEPA filter, it ensures air is evenly distributed before passing through the filter, thereby creating a uniform and stable vertical laminar airflow at the air outlet.
Filtering efficiency ≥ 99.97% for particles ≥ 0.3μm.
A higher-grade filter, efficiency ≥ 99.999% for particles 0.1–0.2μm. Used in ultra-high standard fields like semiconductors and biosafety laboratories.
As dust accumulates on the filter media, the resistance increases. When the resistance reaches an unreasonable level, the filter must be discarded. Sometimes, excessive resistance can cause previously captured dust to become dislodged and re-enter the airflow; when this risk arises, the filter should also be replaced.
The resistance of a filter increases with higher airflow rates. By increasing the surface area of the filter media, the relative velocity of air passing through the filter can be reduced, thereby decreasing the resistance.
