Parametric Ventilation / Filter Grid

A fully parametric ventilation and filter grid designed for wall outlets, fans or air ducts.
All important dimensions can be adjusted directly in OpenSCAD, allowing you to generate the exact size and grid type you need.

The model automatically generates the frame around the mounting holes and keeps the grid evenly distributed.

Perfect for:

• Wall ventilation outlets
• Fan covers
• Dust filters
• Air intake protection
• Drain / weather grids

Features

• Fully parametric design
• Adjustable mounting hole distance
• Multiple grid types
• Optional round or rectangular design
• Symmetrical grid distribution
• Automatic frame generation
• Optional 45° drainage louvers for outdoor vents
• Chamfered edges and screw holes

Available Grid Types

• Square Grid
• Diagonal Grid
• Honeycomb Grid
• Horizontal Louvers
• Vertical Louvers
• 45° Drain Louvers (for wall outlets and water drainage)

Parameters

Mounting

filter_breite
Distance between screw hole centers (X axis)

filter_hoehe
Distance between screw hole centers (Y axis)

schraubloch_durchmesser
Diameter of the mounting holes

Frame

rahmenbreite
Width of the frame around the mounting holes.
The screw hole is centered within this width.

Example:

rahmenbreite = 10

• 5 mm toward the grid
• 5 mm toward the outer edge

Grid

gitter_typ

Options:

Quadratisch
Diagonal
Waben
Lamellen_X
Lamellen_Y
Filter_45

stegbreite
Thickness of the grid bars

zellenweite
Distance between grid elements

Shape

form

Options:

Eckig
Rund

eckenradius

Corner radius when using rectangular shape.

Thickness

rahmen_dicke

Total thickness of the model.

Chamfer

phase

Adds a chamfer to:

• outer top edges
• screw holes

Additional Options

aussen_zugabe

Extra outer margin outside the frame.

verbindungssteg

Extra reinforcement between frame and grid.

Printing

Recommended settings:

Layer height
0.2 mm

Walls
3–4 perimeters

Infill
15–25%

Supports
Not required

Material
PLA / PETG / ASA

For outdoor vents PETG or ASA is recommended.

Notes

• The grid is automatically centered and evenly distributed.
• Remaining space is split symmetrically to avoid uneven cells.
• The Filter_45 option creates angled louvers for water drainage in wall outlets.