Climbing the tallest building in the Southern Hemisphere in full firefighter kit, Ngahi Bidois will be motivated by a fire in his belly to honour his mate for a good cause.

Next Saturday Bidois, a professional international speaker, will suit up and climb the 1103 steps of the Auckland Sky Tower to raise money for Leukaemia and Blood Cancer New Zealand (LBC).

The Firefighter Sky Tower Stair Challenge is an annual fundraiser for LBC which is now in its 15th year, raising $1.25 million last year for LBC which receives no government funding.

In 25kg suits, 100 firefighters and community