20x AirBoss FlexAir 40mm HE2 Nato Respirator gas Filter Cartridge Niosh S-70013. Lot of 10 AirBoss FlexAir 40mm HE2 Nato Respirator gas Filter Cartridge Niosh P/N S-70013. All of them are individually sealed in a bag and expiry date is 4/2030. Qty: ONE box of 20, more available. No Checks or escrow. 4945 Monaco St Commerce City CO 80022. Sorry we do not offer any warranties on the batteries software and operating system issues. Feedback and Contact Information. Please give us an opportunity to resolve the issue before leaving any bad feedback. We try our best to explain the item with utmost accuracy but sometimes there are human errors.