Prevents “things” from crawling through the ductwork.
The size is for a Ø 127 mm (5") duct, but actually the filter goes into the spigot of the wall grille, which has aperture Ø 120 mm.
Requires mesh pieces to be cut from sheet:
- 300 x 85 mm (1 off)
- Ø 115.5 x Ø 86.5 mm (1 off)
- Ø 86.5 mm (1 off)
Recommend stainless mesh with 40 count (per inch) / 224µm (34 SWG) wire / 42% open area.
(e.g. https://www.ebay.co.uk/itm/264395857537)
The author marked this model as their own original creation.