80mm Fan Gravity-operated ventilation flap
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Gravity-operated ventilation flap 80mm fan to 100mm hose - for enclosures or other uses
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- Creative Commons — Attribution
This is an exhaust air system in which the flap opens via the airflow when the fan is switched on, and closes under the force of gravity when switched off. It can also be finely regulated using a PWM controller.
A 90 mm length of smooth 1.75 mm filament is inserted to serve as the axis of rotation.
The 80mm fan (hole spacing 71.5 mm) is attached to the inner section using four M4 screws and four M4 nuts (depending on fan thickness—M4x16 should fit for 8015 models). The flap is installed using a smooth piece of filament (if there is too much friction, slight adjustments with sandpaper, a 2mm drill bit, etc., may be necessary—the flap must close smoothly under gravity at the pivot point).
The enclosure panel is clamped between the inner part and the outlet duct (straight or optionally 90°)—requiring a cutout of approximately 100x100 mm—and secured with four M3 screws und nuts.