It's super simple with the right tools... which I left at work and had to improvise...
Order a retrofit kit. Basically it's a filter and a cover and screw. Remove lower cover. On the underside between the fan and evaporator you will see a space made for the filter to go in. Cut out along the line. Just go slow and easy. Hot knife would work extremely well here. Then it's just a matter of sliding the filter in and putting in the new filter cover. Then put your lower cover on and your all set.
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