Aprilaire #10 AA-10-WP Comparable Humidifier Water Panel 2 Pack<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Fits Space-Gard/Aprilaire furnace humidifier models 110， 220， 500， 500A， 500M， 550， 550A， and 558 </span></li><li><span class="a-list-item"> For optimum performance， replace every 6 months </span></li><li><span class="a-list-item"> Removes pollutants from the water used by your humidifier </span></li><li><span class="a-list-item"> Convenient 2 Pack Offering </span></li><li><span class="a-list-item"> Replace filter every 12 months </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51agouV8T6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51agouV8T6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/514QWohpgfL.jpg" noproxy>