Is this 3D model free to download?

Yes, KNOL Labs // Printable Louvered Passive Air Inlet for Indoor Horticulture is free to download from Thingiverse. Open it in the free Thinger app, or use the "Download from Thingiverse" link to open the original listing by the creator.

Where do I download the STL file?

The download is hosted by Thingiverse. Use the "Download from Thingiverse" link on this page to open the original listing and grab the file, or save it to your print queue in the free Thinger app.

Designed by knollabs, published on Thingiverse. Please credit the creator when sharing your print.

Can I print this at home?

Yes. This is a printable 3D model intended for home FDM and resin printers. Check the original listing for suggested print settings.

KNOL Labs // Printable Louvered Passive Air Inlet for Indoor Horticulture 3D printable model by knollabs

KNOL Labs // Printable Louvered Passive Air Inlet for Indoor Horticulture photo 1

KNOL Labs // Printable Louvered Passive Air Inlet for Indoor Horticulture

Source: Thingiverse by knollabs

The KNOL Labs // Printable Louvered Passive Air Inlet for Indoor Horticulture is a free printable 3D model from Thingiverse by knollabs. The KNOL Labs Louvered Passive Air Inlet is a printable double-louver passive air inlet for hard-sided enclosures, sized to match other 4" flexible duct compatible components. You can download the STL file from the original listing below and print it at home.

Open in Thinger (free) Download from Thingiverse

30 saves Source: Thingiverse Updated 2026-10-12 License: CC-BY-NC-ND · non-commercial Category: Outdoor & Garden

Tags: air inlet, carbon filter, grow light, grow tent, growbox, louver, Louver light Cover, spacebucket, spacebuckets

About this model

The KNOL Labs Louvered Passive Air Inlet is a printable double-louver passive air inlet for hard-sided enclosures, sized to match other 4" flexible duct compatible components. Though it's designed to be a perfect fit when installed with a 4 inch hole saw, the Louvered Passive Air Inlet includes wide flanges to cover a less than perfect hole if you don't have a hole saw. The double-louver design allows air to pass through, but keeps your light in. Designed to work with the: - Hanging Carbon Filter ( - Filter Exhaust Bulkhead ( Recommended Components: - 4 inch Hole Saw: Recommended Print Instructions: - Print in the orientations pictured // KLA-HO-00003-R1 - 21SEP2026

Frequently asked questions

Is this 3D model free to download?: Yes. KNOL Labs // Printable Louvered Passive Air Inlet for Indoor Horticulture is free to download from Thingiverse. Open it in the free Thinger app, or use the "Download from Thingiverse" link above to open the original listing.
Where is the STL hosted?: The download is hosted by Thingiverse, not by Thinger. We link you directly to the original listing by knollabs.
Who made this model?: Designed by knollabs, published on Thingiverse. Please credit the creator when sharing your print online.
Can I print this at home?: Yes. This model is intended for home FDM and resin 3D printers. Check the original listing for suggested print settings like layer height and supports.