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Jon Dev: View up: ventilation duct revisited
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Jon Dev: Industrial design: ventilation duct
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Jon Dev: Concrete walls, metal ductwork, and shadows
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Jon Dev: Concrete walls, metal ductwork, and shadows - #2
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Jon Dev: Ventilation ducts
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Jon Dev: Ventilation ducts - #2
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Jon Dev: Steel ventilation ducts
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Jon Dev: Tilted view: some ventilation ducts revisited
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Jon Dev: Coiled ventilation tubing
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Jon Dev: Train station and condo towers, west Calgary
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Jon Dev: Architecture and infrastructure: at an electricity generating facility - #1
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Jon Dev: Southeast Calgary industrial sites - #4
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Jon Dev: Ventilation duct metal and wall at night