Manually pumping air into an underground shaft - GIF

Manually pumping air into an underground shaft.

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Previously:

https://www.homemadetools.net/forum/...734#post170830
https://www.homemadetools.net/forum/...734#post139991
https://www.homemadetools.net/forum/...741#post163461
https://www.homemadetools.net/forum/...140#post168783
https://www.homemadetools.net/forum/...092#post164922

I would rather build a bellows think it would be more efficient?

Quote:

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Originally Posted by trigger

I would rather build a bellows think it would be more efficient?

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Most definitely, but if your ventilation system looks like that the people in that hole are probably more disposable than that plastic bag. A bellows is not in the budget.