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Fire & Smoke

Certified Fire Performance

Whilst it does not contravene building regulations, the practice of specifying doors and frames separately is not recommended. The resulting doorset may not achieve the required performance, particularly for fire/smoke resistance or sound insulation. Specifying a complete doorset from the Orbis Integrated Doorsets range ensures total regulatory compliance with the resultant peace of mind for
clients, specifier and contractor. Orbis Integrated Doorsets have undergone extensive testing to certify the level of performance for which they are designed.

Fire & Smoke

Fire Testing Standards

The new European standard BS EN 1634: Pt.1 is a far more onerous test and will supersede BS 476 Pt.22. The primary differences between the two standards are:

1. Temperature control method. A difference in the method of control means that to achieve the correct time/temperature curve, the furnace is running between 10-34% hotter in the first 10 minutes of a test to BS EN 1634 than in the same test to BS 476.

2. Pressure regime. BS 476 requires a neutral pressure axis at 1000mm from floor level as opposed to 500mm in BS EN 1634. The lower level of the neutral axis increases the pressure by more than 35%, creating additional pressure at the hinge and latch positions.

3. Cyclic Testing. There is no cyclic testing under BS 476 but a minimum of 500 cycles is required in BS EN 1634. ‘Direct Field of Application’ is included with the later standard so that in the test report, certain changes to the assembly may be allowed subject to the test assembly exceeding the required ‘time to failure’ by a given amount.

FD30 & FD60 Door Sizes

A wide range of door sizes will achieve FD30 and FD60 certification. In all cases there is a balance between width and height so that, for example,
a particularly wide door leaf may be limited in its height. The parameters will vary according to single or double door, latched or unlatched and depending on the type of intumescent package used.

For comprehensive guidance on all door sizes please contact your Laidlaw Technical consultant.

Smoke Control Performance

Only ambient, i.e. cold smoke is identified in Part B of the Building Regulations which refers to testing in accordance with BS 476 Pt31.1. The test only considers smoke leakage at the door head and jambs. BS 5588 Part 11 and BS 8214 require that rated doors should have no more than a 3mm gap at the bottom which can be difficult to achieve with some floor finishes. A new European standard for smoke control will be introduced and shall be determined by testing to BS EN 1634-3 and classified in accordance with BS EN 13501-2.

Fire & Smoke