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I've been using our Henry as a site vac for the past year so have to disagree with this!
Occasionally had to shake the filter out but it's swallowed ~120 years worth of dust from between the floors, a lot of lime plaster, bonding and plaster dust, a shit load of sawdust and all kinds of crap and it just keeps on trucking.
Are there any other considerations if I'm borrowing it? Like should I buy a new bag or something so they don't risk old paint dust in their house when they use it?
Buy a new filter and bag and give it a clean out inside. You might not even need the filter but it would be polite nonetheless.
If paint dust is anything like plaster dust, you'd need to strip it right down and clean it before using again.