n huge construct mindless 

Perception +15; darkvision

Skills Athletics +22

Str +7 Dex -2 Con +6 Int -5 Wis +0 Cha -5

AC  30 (26 when broken); construct armor; Fort +21, Ref +11, Will +13

HP 135; Hardness 10; Immunities mental, poison, death effects, disease, doomed, drained, fatigued, healing, necromancy, nonlethal attacks, paralyzed, sickened, unconscious

Construct Armor Like normal objects, an animated furnace has Hardness. This Hardness reduces any damage the furnace takes by an amount equal to the Hardness. Once an animated furnace is reduced to fewer than half its Hit Points, or immediately upon being damaged by a critical hit, its construct armor breaks, removing the Hardness and reducing its Armor Class to 26.

Speed 15 feet

Melee [>] door +21 (magical), Damage 2d12+9 bludgeoning plus 1d8 fire and Improved Grab

Fan the Flames [>>] The animated furnace opens its door and fans its flames in a 30-foot cone that deals 5d6 fire damage (DC 28 basic Reflex save).

Swallow Whole [>] (attack) Large, 2d8+9 fire, Rupture 15

Bestiary 3, page 18. Expanded in LOIL.