2-pack flt4825 true hepa filter b replacement compatible for g-guardian models ac4825 ac4850pt ac4900ca ac4820 pureguardian ap2200ca plus 8 carcon filter cabiclean <b>instructions:</b><br> 1) remove back cover and discard used filter set.<br> 2) install with arrow pointing towards unit. charcoal/pre-filter should be visible while cover is removed.<br> 3) be sure filter is pressed fully forward.<br> 4) replace back cover until it snaps into place. if the device will not power on, reseat cover.<br><br> <b>g-guardian is registered trademarks of the original manufacturer. this product is high quality aftermarket filter produced by cabiclean. any use of the brand name or model designation for this product is made solely for purposes of demonstrating compatibility.</b>