C2 Filter Canister | Gas Mask and Respirator Wiki | Fandom
The latest run of C2a1 gas mask filters are marked (ASZM-TEDA), C2a1. The (ASZM-TEDA) signifies that these canisters are manufactured with a new type of Impregnated Carbon which offers increased protection against Chemical agents. The filter offers minimal protection against ammonia. C2a1 filters can be dated using the lot number.