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Replacement hood for discontinued 3M H-411 Hood Assembly 3M Hood Assembly S-655 is a wonderfully cost effective option as one is able to replace the hood when it becomes soiled, and reuse the suspension and air ducting. This assembly consists of a S-950 Premium Head Suspension and a S-605 Hood sold by the each. If you are using certain 3M Powered Air Purifying and Supplied Air Respirator Systems, this is an approved option. The newer design of this hood allows for quicker assembly of the entire headtop by the user than previous models.