Which of the following limitations is correct regarding gas masks, otherwise called filter masks?
A maximum of only 30 minutes of protection is afforded with a single canister when in atmospheres containing highly toxic gases.
A canister is reliable for up to 5 years from the date of manufacture, as long as the seal is unbroken.
All canisters must be discarded within 24 hours when the seal becomes broken.
All of the above.
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