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

In this simple example, we're going to be using the default fireball preset within Houdini and using the Kaboom Box HDA to lookdev and render our fireball.  Please make sure that you have installed the HDA correctly, before proceeding.

Inside a geometry node, drop in a Configure Pyro FireBall node.