Does negative pressure have to be maintained at all times in a walk-in containment? Would it be a violation to place negative air machines in a “scrubber mode” at certain times?
The Texas Mold Assessment and Remediation Rules (TMARR) require that if walk-in containment is used, negative air pressure must be maintained at all times inside the containment for the duration of a mold remediation project until the project passes clearance (sections 295.321(g) and 295.322(d)). The purpose of this requirement is to prevent the spread of mold spores to areas outside of containment. However, the department recognizes there may be some situations when maintaining negative air pressure may not be advisable or possible at certain stages of the project. In some of these situations, and only when active remediation is not occurring, the use of continuous air scrubbing of the area instead of negative air pressure may be sufficient to prevent contamination of areas outside of the containment. The department has therefore implemented a policy to allow licensed Mold Assessment Consultants to use their professional judgment to determine for each project under what conditions, if
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