Upgrading certified fire doors

[twane_tredoux]

Hi, I was wondering if you have a certified FD30 fire door and replace the intumescent strips with combined intumescent smoke strips (essentially upgrading the fire door to a smoke door), does this negate the certification of the door or does it simply become a certified FD30S door?

[Mike North]

Probably not, but try bat wings they are far more robust

[Neil ashdown]

The point about a certificated fire door is that the label on the top edge of the door leaf enables you to find the certificate of approval at  https://www.warringtonfire.com/certified-companies/check-a-certificate   Read the certificate to find out the requirements for the smoke seals.

In this way the door retains it's certification and becomes FD30(s).

[Mike North]

When using smoke seals care must be taken to read both the door and seal certificate.

CF218   Page 5

However, CF341

So yes they are allowed, but at least one fin must be continuous