Yes, they do because they have an assembly instruction. All manufacturers that have alternative solutions via an assembly instruction take responsibility for these.
Didn't know that assembly instructions had come out now, last time I talked to maxit about this, they spoke about a fiberglass mesh as an alternative to steel mesh in bathrooms. But it's great that they are now taking on this construction.
They have both options. Fiberglass or steel. They've been using fiberglass for quite a while. At least the last 2 years that I've been dealing with their stuff.
Fun that they have started with reinforcement also now.... So is it new rules from July 1st this year.... Well, then there's no doubt about it... Just reinforce ,,,, But otherwise the 644 is very smooth to work with.....