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MR50 Monovent ventilator

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

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.



Range Brochure


Fixing instruction


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NBS Specifications

Have a question?

For any questions or queries about our product ranges and the technical support services we can offer, please contact us using the form below.

Glidevale Protect is a division of Building Product Design Ltd.

Other subsidiaries include ventilation systems specialist Passivent and Kingfisher Louvres, manufacturer of aluminium louvres systems.

Important Notice

Please be vigilant of fraud/cyber crime. If you receive an email from our parent company Building Product Design Ltd, please check that the email address from the sender ends in '' and any phone number given is 0161 905 5700.

If you receive any emails ending in '' or '', these are NOT legitimate, and you should contact us as soon as possible at

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