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99 Canal Street
Putnam, CT 06260
Phone: 860-237-8245

ClearStak, LLC is a privately held environmental testing lab located in Putnam, Connecticut. ClearStak is ISO 17025 and EPA accredited for emissions and efficiency testing of wood heaters, hydronic heaters, and forced air furnaces.

ClearStak Approved as an EPA Accredited Testing Laboratory

ClearStak, LLC, a laboratory located in Putnam, CT has been approved as an ISO 17025 and EPA Accredited testing laboratory. Under the New Source Performance Standards for residential biomass heaters (NSPS), put into effect May 2015 by the Environmental Protection…


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