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diff --git a/game/server/filters.h b/game/server/filters.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Filters are outboard entities that hold a set of rules that other
+//			entities can use to determine behaviors.
+//			
+//			For example, triggers can use an activator filter to determine who
+//			activates them. NPCs and breakables can use a damage filter to
+//			determine what can damage them.
+//
+//			Current filter criteria are:
+//
+//				Activator name
+//				Activator class
+//				Activator team
+//				Damage type (for damage filters only)
+//
+//			More than one filter can be combined to create a more complex boolean
+//			expression by using filter_multi.
+//
+//=============================================================================//
+
+#ifndef FILTERS_H
+#define FILTERS_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "baseentity.h"
+#include "entityoutput.h"
+
+// ###################################################################
+//	> BaseFilter
+// ###################################################################
+class CBaseFilter : public CLogicalEntity
+{
+	DECLARE_CLASS( CBaseFilter, CLogicalEntity );
+
+public:
+
+	DECLARE_DATADESC();
+
+	bool PassesFilter( CBaseEntity *pCaller, CBaseEntity *pEntity );
+	bool PassesDamageFilter( const CTakeDamageInfo &info );
+
+	bool m_bNegated;
+
+	// Inputs
+	void InputTestActivator( inputdata_t &inputdata );
+
+	// Outputs
+	COutputEvent	m_OnPass;		// Fired when filter is passed
+	COutputEvent	m_OnFail;		// Fired when filter is failed
+
+protected:
+
+	virtual bool PassesFilterImpl( CBaseEntity *pCaller, CBaseEntity *pEntity );
+	virtual bool PassesDamageFilterImpl(const CTakeDamageInfo &info);
+};
+
+#endif // FILTERS_H