Aerial ladder - AbsoluteAstronomy.com

An aerial ladder is one of the three basic categories of aerial apparatus.

The aerial ladder:

can telescope out to increase its length.
primary functions include: ventilation, rescue, elevated master streams, and access to upper floors.
may have a pre-piped waterway or a hand lay going up the center of the ladder.
some do not have an onboard water tank, but most modern aerial ladders do carry 300 to 500 gallons of water.

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