| 摘要 |
An air filter restriction indicator may comprise an indicator tab, a spindle inserted into the retention hole, a spindle-biasing member situated coaxial with the spindle, a tab-biasing member connected to the indicator tab; and a tab housing; wherein the indicator tab is adapted to extend through an indicator hole. The tab-biasing member may be adapted to move the indicator tab between a non-signaling position and a signaling position. The spindle may be situated within an effluent outlet for restraining the tab-biasing member from urging the indicator tab from the non-signaling position to the signaling position. The spindle is situated for subsequently releasing the indicator tab when pressure in the effluent outlet drops below a predetermined value relative to an ambient air pressure outside the filter housing.
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