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Thank you both for help.There is one more thing I want to fix.Dont know why but the final render is much darker in other apps like photoshop or game engine.I want to save it as I see it in the Houdini Render View.

Hello, so I simulated a few explosions using fireball preset and sphere object but when I render it the fire sphere is always there.I tried to keyframe the uniform scale of the sphere object and also the source volume activation but it didnt helped.Its ok to have it there for the first 30 frames but it looks weird after the fire is gone and there is only burning sphere with disappearing smoke at the bottom.Can somone please help me to hide it?Thanks.