Ventilation grille Ø 160 for EPP ducts

Clips into the foam duct with four snap lugs — not a single screw.

The grey grille head-on in front of the pegboard, the honeycomb pattern in the inner ring

From behind: the inner ring with the four snap lugs that clamp inside the duct

Close-up of the inner ring, the grille sitting flush inside it

The same grille at an angle from the side, the wide outer ring standing out

The EPP foam duct the grille is pushed into

Material: PETG
Layer height: 0,2 mm
Print time: ca. 3,5 h

At the wall opening of a heat pump sits a foam duct made of EPP. You can buy a grille for it, but rarely in the size you actually need — and screwing into foam isn't something you want to do.

This grille holds without screws. Four snap lugs clamp it inside the duct, considerably firmer than the plain standard version. Push it in until they grip, done.

The dimensions

Ø 160 mm inner ring — the duct
Ø 240 mm outer ring — covers the opening as well
four snap lugs, printed in one piece

The grille edges are rounded on top so the airflow doesn't catch on sharp corners, and the grille sits flush inside the inner ring rather than on top of it.

Before printing

Measure the inner diameter of your own duct. EPP varies a little between manufacturers, and with a clamp fit that's exactly what decides between a firm seat and a wobble.

Printing

0.2 mm layer height, 2 wall lines, Arachne
20 % infill, grid or cross hatch
Z seam at the back, outer wall around 150 mm/s
no supports
PETG; where sunlight reaches, go for ASA

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