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• Make sure only NIOSH approved airline hoses are used • Adjust pressure relief valve, to adjust for any change in number of users, or lengths of airline hose. o Check condition of filter elements. o Replace if necessary. 4) If there is a drop in outlet pressure: • Check if exhaust filter housing and canister is cross-threaded or not seated firmly onto housing gasket. o Remove canister, inspect threads and gasket and reinstall. • Check for dirty inlet filter element. o Replace if necessary. • Ch