A combination particulate filter with additional nuisance level organic vapour and acid gas protection. The filter may also be used to protect against up to 10 x Threshold Limit Value (TLV) Hydrogen Fluoride (HF). This filter may be suitable for use in some smelting operations and preferred due to its lightweight as compared to a standard gas/vapour filter. This filter may also be suitable for operations where the primary hazard is particulate but nuisance odours are also present, such as in mold remediation, coking, foundries & metal working, food processing, waste handling or composting. 3M recommends the use of the TR-6800FC filter cover to help protect the filter from physical damage. The TR-6800FC filter cover is also used to hold the TR-6600 prefilter or TR-662 spark arrestor in place.