Slate Ventilator Range


The range of hooded slate ventilators are designed for new build and refurbishment work to enable ventilation or extraction through a slate roof. The larger format can even accommodate random sized slates.

  • Description & Key Features

    Product Description

    The GRSV45 and GRSV45R (Refurbishment) Slate Vent are designed for use with random slates and have a base size of 600 x 450. They can be used for both high and low level roof ventilation requirements.
    Alternatively the GRSV45 can also be used as an outlet terminal for extraction fans and soil pipe ventilation when used in conjunction with a Manthorpe GRPA Flexible Pipe. This is not possible when using the GRSV45R.
    The hood of the GRSV45 features a 4mm fly screen to prevent blockage from falling debris and entry of large insects into the roof space.
    The GRSV45 has been extensively independently wind tunnel tested to the following standards:-
    BS 6367 Deluge test 225mm/hour rainfall.
    Driving rain test down to a roof pitch of 15 degrees with an up roof wind speed of 13m/s and a rainfall rate of 200mm/hour to generate a fine penetrative spray.

    Key Features

    • 10,000mm²/M of air flow per unit
    • Replaces an existing slate
    • Larger base available for random slates
    • Can be cut down to fit
    • Integral cowl with insect grill
    • Slates without spigot available for retrofitting
  • Technical

    Fitting Requirements

    The vent takes the place of one standard slate, for smaller slates trim slate vent along marked lines.

    Cut the two slates directly below the slate vent to allow room for the spigot. Cut an inverted “T” in the felt and fold back. Fix slate vent into position using holes provided and a copper disc rivet at the front edge.


    Manthorpe GRSV Slate Vent Wind Tunnel Test.pdf

    Regulations & Standards

    BS 5250:2011 Control of Condensation in Building

    BS 5534:2014 Code of Practice for Slate and Tiling

    BS 490:2004 Concrete tiles and fittings for roof covering

    BRE prEN 15601

    Building Regulations 2010

  • Specifications

    Size Information

    Base format:
    600mm x 450mm

    Trimmed format:
    500mm x 250mm

    Minimum pitch: 15°





    Quantity Information

    5 per box

    10 per box