Extractor ducting and fire building regs.

[cox377]

Hello guys,

I was going to drill a hole in the ceiling and use a 110mm white soil pipe hidden behind a RSJ box as a ducting from the hood extractor to then vent outside. I've suddenly realised that 110mm pipe isn't going to be fire proof and therefore not re-create the fireproof seal required in the ceiling. Would the standard ducting sold in 350mm lengths 100mm be any different?

Thanks in advance

James

 

[noseall]

So long as you replace any plasterboard to the required spec' then the ducting material is largely irrelevant.

 

[hotrod]

Sounds as though James is enquiring about a fire collar:-

http://www.firestem.co.uk/htm/prod_pipe_collars.htm

 

[cox377]

I think your right, a fire collar looks like what I need. Something to close the whole up in the event of a fire.

I'm guessing that any normal ducting like this

http://www.tlc-direct.co.uk/Products/FD51900.html

Has no fire protection?

thanks in advance

James

 

[cox377]

I think which ever way I look at this, it's going to look a bloody mess. I think installing a pipe and then increasing the box size is the only option.

J

 

[freddiemercurystwin]

Presumably the extractor duct is running parallel with the steel? If so then just box the steel in its own fire proof plasterboard enclosure and run the extractor in its own separate plasterboard enclosure joined to the steel enclosure to make one larger one.

 

[cox377]

This is the conclusion i have come to. Bloody shame I didn't think of this before I put all the boxing up for the beam.

Hindsight and all that lol

J