| 摘要 |
Methods and apparatus are described for a lifter box vacuum air filtration system. An apparatus includes a stack of pet furniture units including a lifter box unit including a vacuum inlet, a fan coupled to the vacuum inlet; and a lifter box air shaft coupled to the fan; and another box unit coupled to the lifter box unit, the another box unit including another air shaft. The lifter box air shaft and the another box air shaft are coupled together to align the lifter box air shaft with the another air shaft and define a ventilation conduit. A method includes operating a lifter box unit including evacuating gas from the lifter box unit through a vacuum inlet that defines an air intake that is located along substantially all of an upper, interior edge of the lifter box.
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