KILARGO RETROFIT INTUMESCENT FIRE DOOR BOTTOM UPGRADE SEALS 820-1220MM
KILARGO RETROFIT INTUMESCENT FIRE DOOR BOTTOM UPGRADE SEALS 820-1220MM
The Kilargo FDBU60 retrofit intumescent fire door bottom upgrade seals rescue fire doors with severely oversized bottom gaps – sealing gaps up to 60 mm under nominal 35 mm (FDBU60-35) or 45 mm (FDBU60-45) proprietary fire doors. Up to 2 hours fire resistance, fitted without removing the door.
Key Features
What It's Used For
Floors get re-levelled, carpets removed, doors trimmed – and suddenly a fire door hangs 40mm above the slab. The FDBU60 turns that write-off into a compliant door again, sealing gaps that no conventional seal can approach.
Kilargo 4000 Series threshold plates may be added for aesthetics and disability compliance. Select -35 or -45 to match your door thickness, and confirm approvals with your door manufacturer.
Specifications
| Type | Retrofit intumescent fire door bottom upgrade seal |
| Gap capability | Up to 60mm under nom. 35mm (FDBU60-35) or 45mm (FDBU60-45) doors |
| Materials | Anodised aluminium, silicone gasket, integral intumescent seals |
| Fixing | Pre-drilled slotted holes & screws (door stays hung) |
| Finish | Clear anodised (silver) with grey gaskets |
| Available sizes | 820mm, 920mm, 1220mm |
| MPN | FDBU60-35 / FDBU60-45 |
Compliance & What It Means
Fire and smoke approvals apply to tested, proprietary door assemblies. Always confirm suitability for your specific door type and required rating with your fire door manufacturer or building certifier.
Which version do I need - FDBU60-35 or FDBU60-45?
Match it to your door thickness: FDBU60-35 for nominal 35mm proprietary fire doors, FDBU60-45 for nominal 45mm. Both seal bottom gaps up to 60mm maximum.
Does the door need to come off?
No - the seal screws to the bottom of the door leaf through pre-drilled slotted holes with the door in place. Matching end plate packs (ISRC FDBU60EPP) are available for a finished look.
How does an intumescent fire seal work?
The core is an intumescent material that stays inert at normal temperatures. In a fire, the heat makes it expand to many times its original volume, packing the gap between door and frame with an insulating char that blocks flames, heat and hot toxic gases - preserving the doorset's fire rating for its tested duration (up to 2 hours).
Which fire doors is the FDBU60 approved for?
It is fully tested to AS 1530.4 for up to 2 hours on proprietary fire door assemblies in accordance with AS 1905.1. Approvals are specific to tested door types - always confirm with your fire door manufacturer or certifier that the seal is covered for your doorset and required rating (FRL).
What is the handling time for this item?
This is a non-stocked, specialty architectural item ordered directly from the Kilargo factory. Allow a standard handling time of 5–8 business days after cleared payment before dispatch. If your project needs express turnaround, call Prime Hardware on 1800 329 028 to confirm current factory lead times.
I'm not sure this is the right seal for my door — can I get help?
Yes. Door sealing depends on your door type, the gap sizes and what you need to seal against (fire, smoke, sound, weather or drafts). Call Prime Hardware on 1800 329 028 with your door details and gap measurements and we'll confirm the right Kilargo seal, size and finish before you order.
