Let's talk about preventative measures. I have 6 Antminers of my own in my apartment and I am always checking their temperature. I think the general consensus seems to be to keep the miners 50 degree celsius or below. Also, use the formula Watts= Amps x Voltage and stay below 80% of max load. I have a fan blowing into the room and a exhaust duct blowing out of the dryer duct. I currently have a 4" inline fan from Home Depot powering the duct but it sucks so I ordered a more powerful one on Amazon. I may even hire an electrician to check the setup. Glad you are okay dude.

The ventilation as-is is not enough. Right now the outside weather is cool and I have the mining room door wide open with a fan blowing in. I'll see how things go when the more powerful inline duct fan comes in.
edit: I just unplugged my Antminers and will remain so until further research into safety. Thanks for sharing your story.
Antminers weren't the cuprit here for the OP, Block Erupter Cubes were. The Bitmain gear is better designed, has better quality control and are better built. I've never seen or heard of an S1 catching fire - but that's not to say they wouldn't if you have them overclocked and running on a crappy PSU. However, having said all that, I don't believe you will have a problem with your setup. As long as you are keeping an eye on your equipment and have a fire extinguisher nearby
just in case, you should be just fine running Antminer S1's 24/7.