Vectaire/Manrose Extractor Fan 4-inch Duct NRV
thingiverse
A simple flap valve to insert into the duct behind your Vectaire or Manrose extract fan and the outside world to prevent ambient air blowing back through the duct. You can either print the whole thing in one go (but you might need to sand edges depending on the accuracy of your printer) or as separate parts that can be snapped together. There is a small 2mm hole in the outer ring where you insert a bit of a matchstick, cocktail stick or a bit of filament to stop the flap swinging inwards. This object was made in Tinkercad. Edit it online: https://www.tinkercad.com/things/9rGrB3aSdX8
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