Underfloor, Through-Wall and
Cavity Ventilation
Modern constructions using higher levels of thermal insulation require increased levels of ventilation within the building fabric to prevent the build-up of moisture and condensation.

The increase in U-value requirements from
0.45 to 0.25 W/m2K for floors and from
0.45 to 0.35 W/m2K for walls in the revised
Building Regulations Part L has heightened
the importance of ventilation.

With the increasing awareness of hazardous subsoil gases such as radon and methane, the need for underfloor ventilation has become even more apparent.

Glidevale have a range of underfloor, through-wall and cavity wall ventilation products which meet the regulatory requirements and provide protection against driving rain, birds, rodents and large insects.

MV250 Airbrick

Ventilation area 6000mm2.
Colours: terracotta, buff, anthracite black
Driving rain resistant.
Standard brick face dimensions.
Injection-moulded components.
Can be stacked in multiples.
Can be used with MV255 Straight Sleeve     and MV251 Periscope.

MV251 Periscope
Provides ventilation beneath suspended
    floors.
Vertical adjustment for 3 to 4 brick
    courses.
Works in cavities from 50mm to 100mm.
Can be used with MV250 Airbrick,
    MV254 Vertical Adaptor and MV253 Vent
    Pipe Adaptor.

MV253 Vent Pipe Adaptor
Connects to 100mm internal diameter
    pipe enabling remote voids to be
    ventilated.
Can be attached to MV250 Airbrick,
    MV251 Periscope or MV255 Straight
    Sleeve.

MV254 Vertical Adaptor
Fits between the two halves of the MV251
    Periscope to increase the overall depth
    adjustment up to 5 to 6 brick courses.
Modular design allows additional units to
    be used for even greater depths.

MV255 Straight Sleeve
Attaches to MV250 Airbrick for straight
    through-wall applications.
Works in wall thicknesses from 258 to
    305mm.
Compatible with MV253 Vent Pipe
    Adaptor.

MV650 Weep Vent
Cavity wall vent and weep in one
     innovative unit.
Ventilation area 220mm2.
Colours: terracotta, buff, grey.
Driving rain resistant with protection
    against large insect ingress.
Fits into a single perpend joint
Can be used with brickwork or blockwork
    and in rendered walls.