John Bullivant, Technical Manager at Eterna Lighting, provides us with a guide to 30, 60 and 90 minute fire rated downlights.
Building regulation Part B speciﬁes the level of ﬁre protection required within different types of properties. Typically the requirement for ceilings are either 30, 60 or 90 minutes and in each instance the ceiling joist spacing and plasterboard speciﬁcation will be conﬁgured to achieve the required duration of ﬁre resistance.
When cutting a hole through a ﬁre-rated ceiling to install a recessed downlight the integrity of the ceiling is compromised and this increases the risk of the spread of ﬁre. It is therefore important to choose a suitable ﬁre rated downlight that will maintain the ﬁre rating of the ceiling.
There are separate 30, 60 and 90 minute tests for ﬁre rated downlights. In each test the ceiling conﬁguration is different with ceiling thickness and joist centre spacing altered to simulate typical 30, 60, 90 minute ceiling constructions.
It is important that ﬁre rated downlights pass all three tests separately as the differences in ceiling construction mean it is not safe to assume that passing the 90 minute test means a downlight would also pass the 30 and 60 minute tests.
All Eterna ﬁre rated downlights have been tested within 30, 60 and 90 minute ceilings and their installation will restore and maintain the original ﬁre rating of the ceiling.
The downlights utilise intumescent material to achieve their ﬁre rating – this material is designed to expand at high temperatures and, in the event of a ﬁre, seals the hole and blocks the passage of the ﬁre from passing through the downlight.
Eterna has recently launched a new fire rated downlight under its EternaPro range, offering a five-year warranty from installation.
The high performance 8W downlight is dimmable, boasts an energy efficiency of A+ and is designed to fit a hole size of 76mm. It boasts a beam angle of 60° and the IP65 rating also makes it usable in bathrooms.
The new downlight is colour selectable with warm white, cool white and daylight (3000K, 4000K and 6000K respectively) and will achieve 780 lumens in cool white, 770 lumens for daylight and 670 lumens at warm white.
There are three products in the range, one for each bezel colour option of polished chrome (product code: IFIRELCSCR), brushed nickel (product code: IFIRELCSSN) and white (product code: IFIRELCSWH). It is fully fire rated to 30, 60 and 90 minutes and, to help with easy installation, the product comes with a connector terminal block which also has four terminals to allow for loop in/out lighting circuits.
For more information about the range of fire rated downlights from Eterna Lighting visit: www.eterna-lighting.co.uk