Howdy, Here: https://www.hearth.com/econtent/index.php/forums/viewthread/64906/P44/#745329 , over on a thread discussing the upcoming Woodstock "Firecat" (just a suggestion), Slow1 commented: That got me thinking, which is admittedly easy to do. Anyway, I only know of three EPA stoves with fireboxes greater than 3.5 cuft (EDIT--was 3.0)--the Hearthstone Equinox, Blaze King King, and Kuma Sequoia--and all have 8" flues. Could it be that for some regulatory reason, all EPA stoves with a firebox > 3 cuft must have an 8" flue? Asked another way, does anyone know of an EPA stove with an over 3.5 cuft firebox (EDIT--was 3.0) that doesn't have a flue 8" or larger? Thanks for any insights, and happy burning.