Firefighters from 15 stations are battling a blaze on the top floor of a surf club in Sydney's east.

Shortly before 7.45pm (AEST) tonight, revellers were evacuated from the Maroubra Seals Sports Club after smoke began filtering down through air conditioning vents.

Firefighters battle the blaze at Maroubra Seals Sports Club. Credit:Fire & Rescue NSW

Some 70 firefighters were at the scene and managed to contain a severe fire in the building's plant room, just above the fifth floor gym.

Superintendent Ian Krimmer from Fire and Rescue NSW (FRNSW) said two people had been treated for minor injuries.