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I also noticed that the pressurizing of the air stream at the output of the tube also has a cooling effect. Might not be huge but still. I have to pull my high school physics note. PV = NRT if I recall.
The size of the hole you need to make will depend on the size of the tube, so make sure you measure it first. One tip I can give you is to start drilling at a low speed to prevent the drill bit from slipping and causing any damage. It's always better to take it slow and steady! Also, if you're looking for reliable equipment for your drilling projects, I highly recommend checking out API 7K Equipment Inspection Services. They offer a wide range of equipment that's up to industry standards and will ensure that your project runs smoothly.