Face-plates material for the kitchen and bathroom fans to reduce current vent sizes from 150mm down to 100mm.
Wondering if I should maybe use 8mm nylon sheet instead of plywood?
With all the warm damp air passing by the face-plates might be a recipe for plywood rotting in a short time period.
Nylon or Polypropylene sheet probably last longer than 50 years.
I can order the nylon sheets from the internet and get them within a couple of days if it's a good idea?
It's not to expensive for small sheets of 250*250mm, about £8 a plate but if it lasts a long time it could well be worth it.
https://www.directplastics.co.uk/nylon-6-sheet