"It started as a fun thing with a couple of Auckland firefighters about 15 years ago and grew. Then they thought why not add a charity and it evolved from there," he said..
When Doughty did his first stair climb in 2008 there were 250 entrants and they raised about $200,000. This year there are three times that number and they are hoping to raise $1 million.
"We represent all facets of the fire service. Ian and I are full-time staff, while Jamie and Aaron are part of the voluntary support staff," he said.
This will be the second stair challenge for Rickard and the first for Witford.
"We've been running the Durie HIll stairs and I did that in full gear for the first time on Monday. It wasn't easy and definitely a shock to the system," Rickard said.
To replicate the run up the Sky Tower, think of going up and down the Durie Hill steps 10 times.
The "veterans" know exactly what the climb requires and it is a mix of stamina and patience.
Tanner said firefighters could remove masks if the going got tough but doing that would relegate them to another division.
The quickest can get to the top in about eight minutes while Tanner and Doughty are looking at about 18 minutes.