gǔ fēng jī
bellows
ventilator
air blower
gǔ fēng
a forced draft (of wind, for smelting metal)
blast (in blast furnace)
bellows
to draw air using bellows
gǔ fēng lú
a blast furnace (in modern times)
a draft assisted furnace for smelting metals
shuǐ lì gǔ fēng
hydraulic bellows
water-driven ventilation (for metal smelting furnace)