I should like a face mask that will give proper protection when fitting loft
insulation, and when working with wood and MDF.

Everything I have tried so far leaves me gasping a lot and unable to breath
easily. I have tried those white hemispherical masks with a valve and
fitting poorly at the edges, which cost two or three pounds; and more
expensive Vitrex masks with rubber face-pieces and replaceable filter
cartridges.

Can anyone give me details of a mask through which I could breath easily?

Regards.