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^^^ this
although, a thicker screen material will block quite a bit of airflow, I work with the stuff and I can say with absolute truth that with the thickest screen material you can find you will block about 34% airflow.
whether that is worth it or not is up to you.
personally, Im going to build my grill blocks with perforated sheet aluminum that allows 43% airflow. this should give me the best of both worlds.
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~Mike
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