A fire suppression device includes a container body having a discharge orifice. A cooling assembly is coupled along an inner wall of the container body and includes a cooling housing body and an agent cup seat. An agent assembly coupled along the inner wall includes an agent cup with a fire suppression agent generator therein. An agent cup fitting is near an end of the agent cup and is coupled with the agent cup seat. Spacing members extend between the inner wall and at least one of the cooling housing body and the agent cup. The plurality of spacing members space the cooling housing body and the agent cup from the inner wall. An insulation layer is coupled between the inner wall and the plurality of spacing members, and a portion of the insulation layer is clamped between the spacing members and the inner wall.