| 摘要 |
An air filter capable of visual indication of a clogged condition thereof includes a housing, a filter unit, a fan unit and a signaling device. The housing has an air inlet, an air outlet, and an air passage extending from the air inlet to the air outlet. The signaling device includes a flap disposed to span the air passage, a horizontal pivot pin connected securely to the flap and pivotable relative to the housing, and a pointer connected to one end of the pivot pin and rotatable with the pivot pin relative to the housing. A reduction in air flow through the air passage attributed to a clogged condition of the air filter causes the flap to pivot and move the pointer relative to the housing so as to indicate the clogged condition of the air filter.
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