Mike North

The maximum gap for a smoke door is 3mm. It may be possible to fit a threshold seal, but I have never come across one that would bridge that gap It may also be possible to lip the door, but again I have never come across one that would bridge that gap You could put a 17mm hardwood threshold detail under the door fixed to the floor, but that may cause a trip hazard

A 15-year-old door would be as compliant with the latest regulations as when it was installed, the regulations for fire doors have not changed, however, there is no guarantee that the doors were compliant then installed or that the doors have not been altered that would make them uncompliant. You should ask the agent why they are not compliant, it may be a latent defect which may be there responsibility

All DCLG guides can be found here Fire safety in the workplace: Fire risk assessments - GOV.UK

Read and inwardly digest for the risks involved leaving fire doors open Rosepark care home deaths 'preventable' inquiry finds - BBC News

Correct, flat doors should be FD30S, this has been the case since at least December 2018. To comply, the head and side gaps should be 3mm ±1mm (irrespective of smoke). The threshold on a smoke door should be a maximum of 3mm. I suspect that the door was never compliant in the first place.

Legally, as long as they are competent, anyone can do it, but it must be correctly installed (the inspector will fail it again if not)

The door should be routered to accept the intumescent strips, they should not alter the door gap. The smoke fins can sometimes bind, some Vaseline can be applied to soften the blade

It all depends on the size of the enclosed area and the risk. If the area is big enough you can call it a place of ultimate safety, but technically it should allow for the restricted dispersal of people

For anything above the second floor, you are more at risk of serious injury or death from jumping out of the window than the fire itself. A decent alarm system should notify you long before the escape route becomes untenable, if the fire is on the other side if the door, you will have a minimum of 30 minutes for the fire brigade to rescue you

A guide to making your small block of flats safe from fire (accessible) - GOV.UK

The use of magnetic hold open devices kind of defeats what the regulations are trying to do here. Without seeing the doors, I suspect you have 2 options; 1. Change the swing of the doors 2. Limit the occupancy of the room

For multiple doors try Our Services - Fire Doors - IMS Group - A Specialist Passive Fire Protection Company

You could take a general image of the area to show the general location, then a close image of the label details before you remove the labels

You may get certification to say that the building was built to building regulations, however a building that was built in the 1980s it does not mean it comply with the current building regulations. Any alterations or maintenance to building would make the original certification null and void as what was signed off is not what was is there now. You need to look at the regulation 38 information, which should be an up-to-date record of all the fire safety information for the building Including fire doors along with the latest FRA and any recent fire surveys to get an holistic view.

look at the installation instructions for the door, some can some can't