Flange for 4 Inch Vent Pipe for Enclosures Offering Optional 2-Sided Compression Inner Fitting
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Friction fit, or various drillable and bored options, for indoor grow, thin-wall enclosures, 3d printer cloth enclosures
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This is a compression flange for a 4 inch HVAC pipe (for dust or fume extraction). The pipe fits a standard HVAC or dust collection pipe at 3.9inch OD.
It has a small lip to help the steel hose clamp sit straight and true and to help build a seal.
It has two parts, one inner and one outer, that compression-fit together and can be permanently glued (for example with IPS WELD-ON) or you could drive a wood or sheet metal screw through it to lock it in place.
Additionally, you can help build a better seal by screwing down the outer edges of the square base, or by taping it at the seams. I've provided 3 versions of the pair: one is unbored, one is countersunk as a pilot hole and the other is countersunk and fully bored.
Because the outer half of the pair is bored, you can just use that as a one piece regular standard 4 inch flange and attach it to a plywood or acrylic sheet with a hole already cut in it.
As with most parts like this, PLA is probably not appropriate, I suggest PETG or ABS, or another material appropriate to your application.
Made for my Topcube 3D A1 Mini Combo enclosure, this flange fits over the velcro square aperture to eliminate any leakage and to attach a 4 inch fume extraction hose.
Revision 2 of the outer flange increases strength at the base of the pipe. Revision 2 of the inner flange changes the pipe-to-pipe interface to correct a tolerance issue.