Question

how do electric and pneumatic nailers differ from powder - actuated nailers?
are much slower
are both stronger
require more training
do not require certification

Explanation:

Powder - actuated nailers are classified as firearms in many regions and require special training and certification due to the explosive charges they use. Electric and pneumatic nailers, while still power tools, do not fall under the same strict regulations as firearms - related equipment. They do not require the same level of certification that powder - actuated nailers do.

Answer:

do not require certification