How to replace this transom/fanlight glass?

[paleblindsdrawnonday]

I just bought a 1980s flat, and all of the doors have transoms/fanlights above them. I really like the fanlights, but they're all glazed with reinforced/wired glass, which I'd like to replace with some clear/frosted glass (which will have to be fire-rated, I assume). How do I remove the glass safely from the frame? I've attached some photos of the frame around the glass.
Do I have to remove the inner frame to remove the glass (is that inner part called the bead)? If so, how? Is it glued, or is there a specific tool for this purpose?

 

[opps]

The square "beads" need to be removed first.

Conventionally, they are normally nailed to the frame.

Run a stanley knife around the paint seal first to reduce the risk of snapping the paint.

Remove the vertical left and right first, then the horizontals at the top and bottom.

Run some gaffa tape over the glass to reduce the risk of it shattering.

A chisel should suffice but it will bruise/dent the beading as you try remove it. A japanese claw bar will reduce the damage.

You may well find that both sides of the glass were held in with either putty or silicone. You will need to break the seal on the other side.

 

[paleblindsdrawnonday]

Thanks! And when I replace the glass, is it the same in reverse - i.e. do I need to use silicone or putty to secure the glass, then nail the verticals and horizontals?

 

[foxhole]

Clear,frosted glass is not fire rated, that’s why it’s wired to keep it together when heat breaks it.

 

[opps]

Thanks! And when I replace the glass, is it the same in reverse - i.e. do I need to use silicone or putty to secure the glass, then nail the verticals and horizontals?

Pretty much, but I cannot comment on the fire regs.

 

[ronniecabers]

You may struggle to get the smaller beads out first , sometimes you need the flexibility of the longer bead to be able to prise it out.
As goes refitting, if it has to be fire glass then there is clear fire glass available but it isnt cheap ( something like Pyrodur ), you'll have to glaze with an Intumescent seal and the beads will have to be screwed in. The door and door frame would also have to be fire rated , you can get a paint that will confirm providing you use the right undercoat. I'd be very surprised , it being a residential property, unless its a House of Multiple Occupancy (hmo ), that there will be a requirement for omit to be fire glass, but having said that after the Grenfell Fire , regs were changed, you may need to consult a ' fire officer ' from the local fire brigade ,they are normally more than happy to offer advise, as they'd rather that than being called out...