Twin-Tub Blower
Mechanically driven twin-tub bellows that supplies cold blast air.
The blower is the tier's only source of blast air, and it wants nothing but a turning axle: couple a waterwheel or a windmill to the cell above it and it starts moving air on its own. Below an axle speed of 0.5 it delivers nothing at all; output climbs linearly from there and reaches its full 45 L/s at 1.5. Run Plated Piping (Straight) from its port to the tuyeres it feeds.
See Furnaces and heat for the pressure a burden demands and Pipe networks and pressure for the plumbing between them.

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topMade by
| Leather x 2 | any Board | Leather x 2 |
| any Board | Nails and strips (Iron or Steel) | any Board |
| any Hammer (tool, not consumed) | ||
| Twin-Tub Blower | ||
Needs: 4 Leather, 3 any Board, 1 Nails and strips (Iron or Steel), a Hammer (kept); makes 1 Twin-Tub Blower
Amounts are the mod's defaults; the recipe-cost level changes them (see recipe cost levels).