防护栏：由电镀铝制成，用于主过滤器。
Protection grid, for main HEPA filter made by anodized aluminium.
吸油口粗过滤器可保护油泵并延长主过滤器的使用寿命。
The coarse filter in suction orifice can protect oil pump and increase filter service life.
主过滤器进行连续清理，次过滤器收集细小颗粒，同时采用热泵来提升总热效率。
The primary filter for continuous cleaning, and the secondary filter for collection of fine particles. Heat pump can also be offered to increase the total thermal efficiency.
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