Patent ID: 6723159
Filing Date: 2004-04-20
Classification: B01D,Y10S

Abstract:
An air filter capable of visual indication of a clogged condition thereof, comprising:a housing formed with an air inlet, an air outlet, and an air passage extending from said air inlet to said air outlet, said housing including a housing body with front and rear ends, a front cover mounted on said front end of said housing body and formed with said air outlet, and a rear cover mounted on said rear end of said housing body and formed with said air inlet; a filter unit mounted on said housing for filtering air flowing through said air passage; a fan unit mounted in said housing for drawing air into said air passage via said air inlet and for blowing air out of said air passage via said air outlet; and a signaling device including a flap disposed to span said air passage, a horizontal pivot pin connected securely to said flap and pivotable relative to said housing, and a pointer connected to one end of said pivot pin and rotatable with said pivot pin relative to said housing, wherein air flow through said air passage in an unclogged condition of said air filter pivots said flap and causes said pivot pin to rotate and move said pointer to a first position relative to said housing, and wherein a reduction in the air flow through said air passage attributed to a clogged condition of said air filter causes said flap to pivot and move said pointer to a second position relative to said housing so as to indicate the clogged condition of said air filter.