You can definitely use a gas forge inside a building -- even a small one -- just make sure there's good ventilation and you have REALLY good heat shielding and fire extinguishing capabilities. If you have power to the building, a good setup is to mount an exhaust fan high up in the wall above the forge and crack a window or door across from it so you get a cross draft that flows across the shop and carries the forge fumes out the fan.
First anvil
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You can definitely use a gas forge inside a building -- even a small one -- just make sure there's good ventilation and you have REALLY good heat shielding and fire extinguishing capabilities. If you have power to the building, a good setup is to mount an exhaust fan high up in the wall above the forge and crack a window or door across from it so you get a cross draft that flows across the shop and carries the forge fumes out the fan.