Some of these instructions have fiber glass or similar for insulation which appears to be used for this. It's not something anyone would want next to their ventilation system or inside it.

This isn't something to even consider without some expert reviews. The projects are also work in progress and overall incomplete with many details missing.

Be careful when you do anything involving ERV and HRV. It's very easy to cause serious damage to the property you live in, harm yourself and others in an irreversible way, or even both.