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MR50 Monovent ventilator

Abutment ventilation Roofing ventilation

Glidevale MR50 Monovent provides unobtrusive ventilation to top edge abutments of lean-to roofs. Its innovative design ensures a continuous ventilation gap of 5000mm²/m.

Glidevale Protect has created two handy visual technical guides to help you choose the correct ventilation strategy for your projects:

Roof Covering ‘Impermeable’ – Download

Roof Covering ‘Permeable’ – Download

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Features & Benefits

  • Provides effective resistance to driving rain and large insect ingress.
  • Unobtrusive when installed.
  • Quick and easy to install, no special tools required.
  • Guaranteed 5000mm²/m ventilation provision to comply with BS 5250 and Building Regulations.
  • Available with integral Aluflash flashing, the revolutionary lead alternative.

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NBS Specifications

Our products are listed on NBS Source with verified specification details, making it easy for architects and specifiers to add them to their projects. Browse key technical info and application guidance directly from our NBS listings.

Frequently Asked Questions

Where would I use the MR50?

The MR50 is designed for use at top edge abutments of a lean-to pitched roofs to provide high level, continuous ventilation.

How much ventilation does the MR50 provide?

The MR50 guarantees a continuous ventilation gap of 5,000mm²/m to comply with British Standard 5250 and Building Regulations.

Can the MR50 be used if I have a window 100mm above the roof?

Our MR50 requires a minimum of 155mm above the roof. If the space above the roof is less than 155mm, we would suggest the use of our AV50 Abutment vent instead.

Do I need to buy extra flashing with the MR50?

The MR50 is supplied with a lead alternative AluFlash apron flashing attached as standard, for dressing over the tiles. It can also be supplied with code 4 lead flashing on a made to order basis. Cover flashing should be used over the MR50 once installed.

Is there a minimum pitch the MR50 can be used to?

The MR50 can be used down to a 15° roof pitch. If the roof has a pitch lower than 15°, it is classed as a flat roof as stated in BS 5250. A flat roof, in accordance with BS 5250, requires a higher ventilation provision, please contact the Glidevale Protect Technical team for further information at: technical@glidevaleprotect.com

What is included in the MR50 pack?

The unit comprises two PVC-U extruded sections (supplied in 1.22m lengths), complete with spacers, washers, screws and clips. The AluFlash apron flashing for dressing over the tiles is supplied as standard.

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