DuraVent approves the field application of noncombustible insulation within the clearance to combustible distance (in wall thimbles or support boxes only) if/when desirable. Approved insulation must be listed / compliant with ASTM E136/ULC S114 as Non-Combustible, have a melting temperature above 2000°F/1100°C, be water resistant with low moisture absorption and be acceptable to the AHJ. Materials would include those made from stone (aka “rockwool” or “mineral wool” insulations). NOTE- Fiberglass insulation is NOT approved!
The latest UL approved installation instruction now available online at www.duravent.com.
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Information published in all M&G DuraVent bulletins is current at time of publication and is subject to change without notice.