For protection against sulfur dioxide and other acidic gases or vapours.

An air storage room is designed at the bottom of the filter box to make inhalation more comfortable;

The filter box adopts shrink packaging, which is moisture-proof and anti-oxidation, so as to ensure the stability of the filter function within the shelf life;
Activated carbon with high iodine value and strong adsorption is used, and potassium permanganate, nano-silver and strong oxidizing alkali chemicals are added to increase the detoxification effect by 2 times;

Packing: (1 bubble 60 packs/piece)