A combined particle filter with additional protection for the degree of impairment of organic vapors and oxygen gas. The filter can also be used to protect against the 10-fold threshold of hydrogen fluoride (HF). The filter is suitable for use on some melting operations and is a popular choice due to its low weight compared to ordinary gas/steam filters. The filter can also be used for tasks where the primary hazard of particles is posed, but unpleasant odors occur, such as mold redevelopment, coking, foundry and metalworking, food processing, waste handling or composting. 3M recommends using the TR-6800FC filter to protect the filter from material damage. The TR-6800FC filter cover is also used as a holder for the TR-6600 pre-filter or the TR-662 spark lock.
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