Ellen W Marshalltown , IA November 07, 2017 Appliance: Whirlpool Refrigerator WRF989SDAH00 Whirlpool Refrigerator Wrf989sdah00 / : Replaced filters. How to replace Whirlpool Freshflow Refrigerator Air Filter. I ordered a new air filter and produce preserver filters. They were extremely easy to replace. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes