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3" PVC PIPE, 10-FT SCHEDULE 40 — The wind catcher shaft. Cut to fit, glue one elbow, and you've built the same stack-effect air column Persian engineers used for 2,400 years.
3" PVC PIPE, 10-FT SCHEDULE 40 — The wind catcher shaft. Cut to fit, glue one elbow, and you've built the same stack-effect air column Persian engineers used for 2,400 years.
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