LabPartnerRx ductless balance enclosures from Mystaire are designed to provide a safe and effective environment for manipulating hazardous compounds. They are engineered specifically for balances and applications that involve manipulating particulate matter. The enclosures protect the operator by capturing particulates first in a MERV-9 electrostatically charged pre-filter before entry into the main filtration zone. A HEPA filter captures particulates at 0.3 microns in size with an efficiency of 99.97% without sacrificing balance stability. The compact, ductless enclosures are factory leak-tested, certified, and shipped fully assembled. The pre-filter can be changed while the enclosure continues to run and can be bagged inside for added protection from potential hazardous compounds.