Think Crucial 3 Replacements for Honeywell HAC-504AW Humidifier Filter A Fits HCM-600, HCM-710, HCM-300T & HCM-315T, Compatible With Part # HAC-504AW, HAC-504, HAC504 HIGH QUALITY AIR FILTER that can replace your Honeywell Humidifier's Filter. Get back to breathing clean air again! HEALTHIER LIFESTYLE! No one wants to breathe in dirty air and if you don't clean your air filter that will be exactly what you'll be doing! Replacing your filter will help clean your air and allow for a healthier lifestyle! EASY TO INSTALL so you can get back to breathing clean air as soon as possible! Simply remove your old filter and put this brand new one in it's place! This filter fits Honeywell HCM-600, HCM-710, HCM-300T & HCM-315T, HCM-1000 series, HCM-2000 series, HCM-300 series, HCM-600 series, HCM-700 series and ECM-250i. SAVE MONEY by using a new air filter! When your Honeywell Humidifier has a clogged or dirty air filter it can cause it to work harder which will end up hurting your electric bill! This is comparable to part # HAC-504AW, # HAC-504, & # HAC504. GUARANTEED SATISFACTION because of a 30 day full money bank guarantee and a trusted Think Crucial warranty. We are so confident in our products that we have no problem giving you every penny back if you're unhappy with your purchase. You won't see promises like that from big box brands!