Your propane valve is probably leaking on the torch. It's not a big problem as long as you dont leave your propane tank open when you arent using the torch.
By the way, I also use an open air porch , but I do use ventilation because I have gotten ill a few times from fumes.
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Melting boro with a National 3A and and two Devilbiss 5lpm 10psi concentrators.
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