没有空气过滤器，以取代或干净，但夏普并建议定期吸尘的进排气口，尽量减少灰尘侵入股。
There are no air filters to replace or clean, although Sharp does recommend periodic vacuuming of the intake and exhaust vents to minimize dust incursion into the unit.
在二行程发动机中，活塞起到阀门的作用，当活塞接近下止点时，使气缸壁上的进排气口打开。
In the two-cycle engine, the piston ACTS as a valve, clearing valve ports in the cylinder wall as it nears BDC.
根据回流压力的变化规律，采取异型排气口、预进气结构等措施减小回流冲击。
The change of back-flow pressure, deformed exhaust hole, pre-inflow structure and so on can be adopted to reduce back-flow impact.
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