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- 2, 4 ft x 8 ft sliding panels
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- 2, 4 ft x 8 ft sliding panels
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- Endwall of 30 ft x 80 ft high tunnel featuring two, 4 ft x 8 ft sliding panels as doors (now open) and a louvered vent above door frame. Vent could be larger.
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- Temperature-sensitive piston on bracket in background and on inside of high tunnel
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- The upright temperature-sensitive piston (containing an oil that exapnds and contracts with temperature) is bracketed to the vent frame and connected to louvers of the vent with a bent arm.
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- Side view of the unit controlling the position of the louvers
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- Opposite-side view of the unit controlling the position of the louvers.
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- weather-stripping on doors and frame can help seal the tunnel when doors are closed.
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- left-hand sliding panel as it slides past frame on left and to outside
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- right-hand sliding panel as it slides past frame on right and to outside
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- 2, 4 ft x 8 ft sliding panels; easy to control opening size as a way to meter ventilation
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- each 4 ft x 8 ft sliding panel is suspended from the track at two points
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- each 4 ft x 8 ft sliding panel is suspended from the track at two points; still “square” and sliding easily after 6 years
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- doors can be removed easily
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- access is easier when snow is in front of a sliding door; weather stripping around door frame provides additional protection
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- simple latch installed after hanging
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- 2, 4 ft x 8 ft sliding panels removed from outside track
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- 2, 4 ft x 8 ft swinging doors still good after heavy use but more tricky to manage and repair or replace
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- fewer, less stable ventilation options than sliding panels
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- the center brace is on the winter “stabilize” position, fixing the right side door in place
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- less costly, reliable swinging doors with wintertime bracing on far end
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- the horizontal braces are in the winter “stabilize” position facing prevailing winds
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- stuff happens when winds are high, wood is old and doors are open
