An apparatus and method for substantially preventing access to an inlet of a vent. The apparatus may comprise a housing attachable to the inlet of the vent and having one or more traps position therein to block insertion of a fluid insertion device through the housing and to the inlet of the vent. The...http://www.google.com.au/patents/US6997205?utm_source=gb-gplus-sharePatent US6997205 - Inlet protection apparatus and method
