(CNN) -- The club is crowded. Folks are drinking, listening to music, having a good time. Then the fire alarm goes off.
Most people will probably ignore it, but know this: If there really is a fire, you don't have very long to get out.
"In most nightclub fires you only have a few minutes to find a way out," Glenn Corbett, an associate professor of fire sciences at John Jay College, said Sunday. "In Rhode Island, it was 90 seconds."
He's referring to the 2003 incident in which 100 people died when fire broke out at a small nightclub in West Warwick, Rhode Island. That time, some survivors escaped by breaking out windows, while others found additional doors besides the main entrance, he said.
Every second really does matter in a crisis, said a division manger for building and life safety codes with the National Fire Protection Association.
"An extra 10 seconds is a lot of time," Robert Solomon said. "Your first thought should be to leave."
Fires in places where people publicly get together are rare but often deadly. According to the NFPA, there were almost 5,000 such fires from 2000 to 2004, with an average of one death and 52 injuries per incident. The number of fires is less than 1% of all structure fires reported by fire departments for that same five-year period.
But the organization said on its website: "Fires in assembly occupancies have shown to be some of the most deadly when the proper features, systems and construction materials were not present."
Corbett said two things are key to making it out of a fire or other dangerous situations alive -- preparation and quick reaction.
Here's what you should do when you get to a nightclub or any other public venue:
• Identify all the exits. In most fires, people try to get out the same way they came in. Go ahead and take a lap around the club and see where other doors are. Check out exits firsthand and see what kind of doors they have. Corbett said it may be difficult to get out a dead-bolt door, or some doors might be blocked by equipment or boxes. If you can, see if a door will stay open or can be propped open, Solomon said.
• Take a look up for sprinkler heads. After the Rhode Island fire, changes in fire codes focused on the need for fire suppression systems. If there isn't one, be wary. "The sprinkler is the best tool available to avoid disasters," Corbett said. Such systems are not always easy to see or identify, Solomon said.
• Is it too crowded? If it feels too crowded, then it is, and you should avoid it, Corbett said. He also said you can call the fire department, which some people might consider overreacting -- but the fire department will deal with hazards.
• Identify the staff members and figure out if there are enough of them for the size of the crowd, Solomon said. "See if you can get any feel or flavor for staffing," he said. "See what they are wearing." Each venue should have crowd managers, whose jobs are to take care of people in emergencies. "They should help shepherd people out."
• Check to see if the staff is monitoring the entry points, Corbett said. Did the people at the door keep a count of everyone coming in? That's a good sign they have your safety in mind.
• If it appears the show involves indoor fireworks, Solomon said he would consider leaving. "There are safe ways to have indoor pyrotechnics but it certainly would make me raise my awareness."
If disaster does strike, it is vital to avoid hesitation.
• If a building alarm goes off, you need to stop what you are doing and get out. Don't worry about being able to get back in or the weather, the experts said.
• Tell everyone in your group which way to go, and remember, most people are going to head for the front door. The danger is that someone will fall and people will tumble over each other. "Then that's it," Corbett said. "That's the point of knowing the other ways out." Even if people are still moving it's likely that because of the mass of people, it will take more time to get out the main entrance.
• Exit signs are subject to code in the United States, Solomon said, and they are spelled out. In other countries, they may be a diagram of a person running, he said.
• Don't try to put out the fire, Solomon said. Get out and leave the emergency response to the crowd managers on staff. That applies even if a fire extinguisher is nearby. The staff should be trained to know where those are, and you need to head for an exit.
• If the smoke gets thick, you need to duck down to the clean air. If you can't see, head straight until you get to a wall and then follow it, Corbett said. Keep a hand up to find a window, he said. Break a window out if you have to escape that way. Solomon recognized that dropping down could be a tough decision because you don't want to put yourself in peril in the crowd rush.
• Once you are out, go to a prearranged meeting point for your group, like your car or a public transit stop.