Our strong performing aluminium trickle vents have been especially developed to meet the requirements of Approved Document F - Means of Ventilation (April 2006 UK).
The Part F (UK) document typically requires 2500 Equivalent Area (EA) for kitchens, utility rooms and bathrooms and 5000 EA for habitable rooms (depending on the ventilation system applied).
EA better reflects the volume of air that will flow through an opening for a given pressure difference.
Trickle vents also need to be controllable and the EA should be clearly marked on the vent
Gas ventilation applications still use "Free Area" (FA).
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Equivalent Area (EA) 2500mm2
Airflow at 1 Pa is 2.3m3 / h *, Airflow at 2 Pa is 3.2m3 / h *,
Airflow at 4 Pa is 4.5m3 / h *, Airflow at 6 Pa is 5.6m3 / h *
|
Slot
Width |
Number
of Slots |
Number
of Bridges |
Width
of Bridge |
Recommended
Length of Slotvent |
12 mm |
245 mm |
1 |
0 |
0 mm |
300 mm |
11 mm |
255 mm |
1 |
0 |
0 mm |
300 mm |
10 mm |
265 mm |
1 |
0 |
0 mm |
300 mm |
9 mm |
270 mm |
1 |
0 |
0 mm |
300 mm |
Equivalent Area (EA) 5000mm2
Airflow at 1 Pa is 4.67m3 / h *, Airflow at 2 Pa is 6.6 m3 / h *
Airflow at 4 Pa is 9.4 m3 / h *, Airflow at 6 Pa is 11.5 m3 / h *
Slot
Height |
Slot
Width |
Number
of slots |
Number
of bridges |
Width
of Bridge |
Recommended Length of Slotvent |
12 mm |
245 mm |
2 |
1 |
15 mm |
600 mm |
11 mm |
255 mm |
2 |
1 |
15 mm |
600 mm |
10 mm |
265 mm |
2 |
1 |
15 mm |
600 mm |
9 mm |
270 mm |
2 |
1 |
15 mm |
600 mm |
* 10% tolerance included
* Test reports on request
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