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HEPA Air Scrubber Chamber gasket and mount etc

by mettauk, published

HEPA Air Scrubber Chamber gasket and mount etc by mettauk Nov 14, 2017
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Summary

Air cleaner for DIY enclosures like the Lack table version etc.

Gasket
The gasket seems essential because dirty air drawn through the HEPA filter can flow along above the top of any activated carbon in the chamber. To prevent this I added a gasket with a small flap which can be pushed past the lip of the frame down into the carbon chamber to stop air simply passing straight through. This should help force the are through the Activated Carbon Charcoal to remove smells etc.
Printed in TPU

Support bracket
Strengthened and widened the support bracket as the complete filter unit weighs around 750g - nearly 2lb.
Printed in PLA but may benefit from PETG or ABS if your enclosure temperatures go high!

Filter Cover
This lid may help reduce the risk of stirring up the captured fine dust and improves the appearance of the HEPA filter assembly.

The lid is a close fit, enlarge as required. The best way to check for a good fit is to cut off object bottom, (see CURA image above) or other slicer by 18mm and just print the lip to see how well it fits your HEPA filter assembly.

NozzleToFan: Added NozzleToFan2.stl component to enlarge recirculated air outlet in line with fan output foot print and included honeycomb grille.

Fan Gasket: Added to improve sound and vibration damping - print in TPU or similar high flex filament.

Rooba HEPA filters are relatively cheap - see Amazon... https://www.amazon.co.uk/Filter-Cleaner-YTJ-Replacement-Filters/dp/B01JVP2OBM/ref=sr_1_22?ie=UTF8&qid=1510709252&sr=8-22&keywords=roomba+hepa+filter

Other parts are as revised/designed by jmillerfo
Full assembly instructions https://www.thingiverse.com/thing:2394452

Edit 14/12/2017:Added 87mm straight pipe and collar gasket.

Print Settings

Printer Brand:

Wanhao

Printer:

Wanhao Duplicator i3 V2

Rafts:

No

Resolution:

0.2

Infill:

15 - 20%


Notes:

TPU or other soft rubber for gasket

Body and support in PLA for below 45-50°c. if going higher use ABS or PETG.

No supports needed except for Filter_To_Fan.stl.

Post-Printing

Glue the Chamber and the Filter_To_Motor components together. Fit a strong fan, HEPA filter, Activated charcoal and fit to wall of cabinet. Fan requires a regulator (Approx 2 amp) to reduce speed and noise.

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Hello,
I have problem to translate your sentence:
"enlarge recirculated air outlet in line with fan output foot print"
Can you explain with different words why you had to enlarge hole?
Other question is about filter position, even on original design:
Was not better to have filter in line with fan? in this way all the air had to move between the carbon filter and no gasket was needed.
I think air will choose faster path then carbon on the opposite site (from fan) will never do its job.

Please consider these questions coming from a "worried" noob, I just need to understand how it's better to realize a working voc filter

Addendum:
You say support are needed for 'Filter_To_Motor' but there no stl with such name, maybe are you talking about 'Filter_To_Fan'?

Hi
The enlarged re circulation vent allows softer re circulation and matches the size of the fan volume. (The vent should face down within the printer cabinet and not up as shown in the assembly drawing). (EDIT: Drawing revised to show correct re circulation outlet orientation.)
This design works for me, the gasket redirects enough as far as I can tell. Air is drawn through the whole of the HEPA filter. Air is drawn through the plastic across the whole depth of the chamber... Clearly there are many ways of doing this!
Yes supports are needed for the filter_to_fan section. (See the drawings for clear visual guidance)

The unit also helps to create negative pressure within the printer cabinet.

Thanks for your prompt answer.
Just another question: do you have inlet openings in your enclosure? where do they are located and how big they are?

Hi, Currently I only have a gap under the door of 3-4mm and I am about to install two 20x40mm adjustable grills at the front right side. One low down and one approximately 30mm from the underside of the lid, the top one will only be opened if it overheats inside and turning the extractor up is not enough! The gap under the door provides 1500mm2 of air inlet so should be enough on its own.The extra vents to the side are to soften air flow.

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