The Kaboom Box HDA is RenderMan's version of the standard Houdini pyro lookdev node, Pyro Bake Volume, allowing RenderMan artists to quickly and realistically render pyro and volume sims, whether that's big explosions or smaller candle flames and everything in between

Once installed, the KaBoom Box sits inside the OBJ context and can easily be dropped into your node network, found under the RenderMan tab.

The HDA requires one input.  That input can either be a cached VDB file sequence or later down the network after your pyrosolver node.