A kiln for $50 USD is a good deal provided that the bricks and/or insulation are in good shape. The front loading door is a plus and most likely can be modified for a bead door.
A PID controller will be necessary for temperature control for the annealing cycle. Or it could be done manually which is a most tedious task. If the latter then a pyrometer with a thermocouple will be needed. For boro your top temperature will be 1050 F or 1175 F for kiln striking. For soft glass less.
There is a good section in the safety part of LE that covers what is needed for ventilation. Overall, there is need to calculate the needed fan CFM. The smaller the opening for a Barley box the less CFM and a less costly fan can be used.
In my case, the numbers came out to 330 to 412 CFM. Went with a Soler & Palau TD250 10" Inline Duct Exhaust Fan which has metal blades and housing plus two speeds. Your needs may vary and there are other fans to choose from at varying price points.
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