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