Outdoor 4in/100mm vent cover

I needed a cover for a 4" exhaust vent and this project is the result!

Features

• Fits 4"/100mm vent pipe
• Wall mount has standard 105mm screw spacing to fit a 120mm fan
• Flap model acts as a valve when used as an exhaust vent
• Modular mount design allows you to replace or change the vent cover with 4 screws
• Wall mount has a slight recess to allow application of construction adhesive
• Outer “cap” fully encloses the mount plate to help shed water
• No supports required, all models should be easy to print
• User-facing sides are printed on the bed to provide a smooth appearance

Requirements

• Suitable filament for outdoor use.  I'm using PETG so it can handle direct sunlight in my area.
• 4x 12mm M5 screws.  Use stainless screws if this will be mounted outdoors or around moisture.
• 4x 5x6x7 threaded inserts
• Construction adhesive or some other means of attaching the mount plate to your exterior wall. I used Loctite PowerGrab as it is compatible with both concrete and plastics.
• (optional) outdoor wire mesh to keep out any rascally varmints.  I used ¼" galvanised hardware cloth.

Assembly

1. Print file Outdoor 4in Vent Cover Wall Mount Plate.stl and install 4x threaded inserts.  These should press fit in with a press, clamp, vice, etc. 
2. The side facing the wall has a recess, apply construction adhesive to the recessed side and affix around vent.
3. Print Outdoor 4in Vent Cover Cap.stl and optionally the Outdoor 4in Vent Cover Flap.stl if this will be an exhaust vent. These parts fit loosely together to allow the flap to move easily when air is moving.
4. Use the 4x 12mm M5 screws to attach the Cap to the Mount Plate.