Does the filter need to be changed and if so, how oftenPost created: 2012-07-12 Type of Equipment: Furnace Views: 86This question was created on the page: http://www.furnacecompare.com/furnaces/lennox/g61v.html. On 2012-07-19 Darryl wrote: Yes,how often depends on the filter.1" filters last 1 to maybe 3 months.High eff. air filters can last up to 1yr Your Answer |