This through-wall venting port has two flap sets so that it is “double insulated” and more resistant to insects and other would-be assailants. I have been using this for a year or so but only now just posting it as I have had several requests recently.

The idea is that on the outside wall, you mount a 4″ duct plate that connects to a 4″ pipe through the wall, and onto which the double-flapped vent mounts.

On the inside, another 4″ duct plate, which connects to the other end of the pipe through the wall, and, on to which you can mount a variety of headers and or an inline fan to assist the exhaust system.

As you have probably seen from my earlier postings, I like having negative pressure in my exhaust system to ensure no leakage and assist the exhaust fans on my various printers. In this case, I have designed it for a low-cost 120x120x25mm inline fan.

The inside headers are designed to work with my quick-connect exhaust and other components so you can build out the system however you choose.

Printing

Functional designs (such as this one) generally require more strength than non-functional designs and more strength than the typical default slicer settings provide, so please review your slicer settings carefully.

This product was designed for a 0.4mm nozzle, a 0.2mm layer height and the following settings:

• Wall Line Count = 4 ( 4 x 0.4mm = 1.6mm walls )
• Top and Bottom Layer Count = 5 ( 5 x 0.2mm = 1.0mm top and bottom )
• Infill = 40%, Cubic
• Ironing = OFF (not needed)
• Wall Generator: Arachne (If you are using Cura this is automatically enabled by default)
• Detect Thin Walls = Not needed but good to keep ON
• Support = NO, all required support is designed into this product
• Brim = NO
• MATERIAL: ASA or PETG recommended
• PRINT ORIENTATION: As per the STL files

Assembly Notes

Please refer to my video for assembly instructions and other notes.

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