Home > Companies > Bilco UK Ltd > UDF-50REM Smoke Vent


  • Designed to satisfy Building Regulations and meets Approved Document B, BS 9999 and EN 12101.
  • Also compatible with other guidance and codes of practices, for example those issued by the British Research Establishment such as BRE 79204.
  • Electric actuation for remote opening and closing.
  • Fitted with solid, insulated covers.


Ten years.

Standard product features

Performance characteristics to EN12101-2:

  • Free aerodynamic area: 1.5 m².
  • Reliability: 1000 (10,000*) *10,000 when used as a day to day ventilator.
  • Snow load: 500.
  • Low ambient temperature: -15°C.
  • Wind load: 1500.
  • Resistance to heat: B.


  • Covers reinforced to support a minimum live load of 195 kg/m² with a maximum deflection of 1/150th of the span.
  • Operation of the covers through a 24VDC battery backed control system that will open the covers to the fire open position within 60 s and be capable of closing the covers.
  • Operation of the covers not affected by temperature.
  • Entire vent weathertight with fully welded corner joints on covers and curb.
  • The smoke vent to be double leaf and provide 1.5 m² clear vent area.


  • 3 mm aluminium with a 100 mm beaded flange with formed reinforcing members.
  • Cover to have a heavy extruded EPDM rubber gasket that is bonded to the cover interior to ensure a continuous seal when compressed to the top surface of the curb.

Cover insulation:

  • Polyisocyanurate of 50 mm thickness with a U-value of 0.47 W/m²K.
  • Insulation fully covered and protected by an aluminium liner.

Wind deflectors:

Wind deflectors 4 mm aluminium with 3 mm EPDM gasket.

Operating mechanism:

Two 24VDC linear actuators per cover (four actuators total) capable of opening the cover to the fire open position of 90º.


  • Heavy pintle hinges provided.
  • Curb mounted junction box (2 no) with terminal blocks enclosed for power cable connection.


Factory finish mill finish aluminium.



  • 305 mm in height and of 3 mm aluminium.
  • The curb formed with a 114 mm flange with 11 mm holes provided for securing to the roof deck.
  • The curb equipped with an integral metal capflashing of 2 mm aluminium, fully welded at the corners, that features the Bil-Clip® flashing system, including stamped tabs, 153 mm on centre, to be bent inward to hold single ply roofing membrane securely in place.
  • A fixed central drip channel through the centre section of the curb.

Curb insulation:

Polyisocyanurate of 50 mm thickness with a U-value of 0.47 W/m²K.

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Bilco UK Ltd


+44 (0)1284 701696

Product reference

1500 mm x 1620 mm, 1728 mm x 1848 mm. 215 kg, 1.5 m².
1500 mm x 1620 mm, 1728 mm x 1848 mm. 230 kg, 1.5 m².


[Not required]
Control Panel Kit (Control Panel, MCP, and Smoke Detector).
Smoke detector.
Auto/ manual control switch.
Open/ close smoke vent switch, keyed.
Open/ close smoke vent switch, paddle.
OS2 control panel.
Open/ close switch.
Weatherproof open/ close switch.
Rain sensor.
MCP with break glass.


[Curb liner]
[Flanged apron]
[Fully enclosed]

Explosion relief smoke vent

[Not required]

Manufacturer details

Park Farm Business Centre,
Fornham St Genevieve,
Bury St Edmunds,
Suffolk, IP28 6TS
Tel +44 (0)1284 701696
Fax +44 (0)1284 702531
NBS Plus
NBS National BIM Library