| 摘要 |
The present invention provides a timer that starts a time cycle when a filter is placed into a housing. The timer cycle will not reinitiate a new time cycle when the previously used filter is removed from the housing and reinserted into the housing. In one embodiment, the filter timer assembly comprises a filter comprising a filter media surrounded by a filter frame, a housing for supporting the filter, a piercing post connected to the housing moveable between a first resting position and a second position in direct contact with the filter frame, and a timer connected to the piercing post. The piercing post punctures a portion of the filter frame to create an opening in the filter frame. The timer initiates a count when the piercing post is actuated to the second position.
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