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Hey!
We use a four inch hole saw to cut the perfect fitting hole for 4inch pvc pipe, it's a drill attachment. The big hole gives lots of airflow and we also use a 3/16 inch drill bit to make a few more holes here and there. Been using these things forever never had a issue, helps contain the heat, just keep it away from the heat source.
We use a four inch hole saw to cut the perfect fitting hole for 4inch pvc pipe, it's a drill attachment. The big hole gives lots of airflow and we also use a 3/16 inch drill bit to make a few more holes here and there. Been using these things forever never had a issue, helps contain the heat, just keep it away from the heat source.