Hi Jason, Yes, Constantly! Have you tried addressing the problem with the temperature / air flow?

Don't you dare switch off the sun :-)

Seems like a sensible option. Dorguards can cost about 80 quid so will not break bank and are easy to maintain. Portable A/C are an alternative.

Yup, sensible and easy solution is the dorgard option. Great invention.

I can't see any issues using these type of devices on fire doors in particular the elctro magnetic type that are linked to the fire alarms system. You still need to check they function correctly and the door fully closes but this can be done on the weekly fire alarm test. Not seen the type which requires a magnet on the floor the dorguard just has a plunger that retracts and most electro magnetic type have the magnetic unit mounted on the wall normally at the top of the door with a metal plate secured to the door. I've seen both types why carrying out fire risk assessment and so long as they are tested i don't see a problem, better than people wedging them open with fire extinguishers. It certain situation you might not be keen on there use in particularly high life risk premises. but for offices i don't see them as a problem so long of course they have a fire alarm siren in place to ensure the dorguards will activate. Phil

Door holders of all types fitted to doors protecting single staircase buildings are deemed not best practice. Indeed, my local fire authority pursue a policy of non acceptance in such cases. So off come the dorgards and mag door holders and in from stage left appears the wooden wedge or extinguisher to do the job. OK, there is a risk of failure with door holders, but it's got to be better than a wedge isn't it? Isn't it time that the rules re door holders on single stairs were changed? Perhaps a more sensible policy would allow any type of holder on such stairs, except sleeping risks, where only those devices with failsafe operation in a power cut (not dorgards) would be permitted.

I believe dorguard now supply a version or as standard that releases at night so the door return back inside it's frame for the very reason you mention. I would have though potentially fire alarm controls panels could be set up to do the same as the most likely risk of fire in spreading and developing undetected would be at night so it would make sense for the doors to be released. as said by messy i would not be keen to see them in sleeping accommodation or on single staircases and would want some form of checking that they are operating correctly. But for the situation mentioned i don't see an issue but better still would be for air cons units to be hired or other steps taken first as these dorguard units aren't that cheap and also there is a risk that they wouldn't just be used during the hot weather but permanently which i think is then reducing the level of passive fire protection for no justifiable reason. Phil

I take it that on ships the fire doors aren't water tight then?

I'm already super-dooper, my mum said so! But seriously, what happens to the fire doors if the hull is breached?

I like OCW's response - correct!! There is a very long answer, but in it's simplest form all ships are divided into compartments. These rise up to the freeboard deck as watertight compartments. In some cases they are penetrated by watertight doors, normally closed at sea. In addition, the hull will have holes in it - doors you drive through on a ro-ro ferry for example. These are also watertight, even though they are above the freeboard deck. Within each of the watertight compartments there may well be fire doors, but these are normally open (have no significant effect on water flow) and operate as do fire doors high in the ship. Can give a longer explanation, but that would be seriously off topic!