Numatic Henry Xtra HVX160 bags and filters
NVM-1CH dust bags and a 11in TriTex pre-motor filter.
Every version in the "Also covers" list takes the same parts.
Dust bags
Pre-motor filters
Finding the model number
It's worth a look at the rating plate first, because names get reused across generations. On the drum-shaped Henry family (Henry itself plus Hetty and Harry) the rating label sits under the carry handle, though some have it on the back of the top section (the hat). James and Charles have it on the back of the machine, and so does George. On the Quick models it's inside the drum. The label shows the model and power rating, plus a serial number that starts with the year and week.
Source: Numatic, 28 Oct 2026
When to change them
A bag lasts up to about a month with average use; change it when the machine feels heavy or suction drops. Check the bag often. The TriTex/MicroFresh filter is not washable: tap or shake the dust off instead. (source)
A bag that's only half full can still be done for: fine dust blocks the pores first, which is why the indicator can go red early after a lot of plaster or fireplace dust.
Seeing a full warning on a fresh bag usually points to a blockage in the hose or floorhead. Check there before blaming the bag.
Washable filters go back in bone dry or not at all. A damp one smells, and on some machines it can let the motor pull moisture through.
Quick answers
If I've got a Numatic Henry Xtra HVX160, which dust bag do I need?
NVM-1CH, sold by Numatic as the Numatic NVM-1CH HepaFlo filter bags.
What pre-motor filters does the Numatic Henry Xtra HVX160 take?
11in TriTex, sold by Numatic as the Numatic 11 inch TriTex filter (160/170 machines).