Features and Benefits:
SVFMIN – Rytons Flyscreened Slim Vent® Minor (Cavity Vent/Weep)
General Details
Rytons Flyscreened Slim Vent® Minor (SVFMIN) is a perpend cavity vent/weep for airflow and moisture control, featuring an integrated flyscreen and a discreet, flush finish.
Features and Benefits:
- Perpend cavity ventilator with internal flyscreen for use in timber frame and traditional build.
- Flyscreen located centrally for a neat appearance and to prevent accidental blockage by paint and airborne debris.
- Unique internal water baffles and specially tapered surfaces prevent water transfer and make the vent an effective weep hole for drainage.
- Clean lines maintain the aesthetic appearance of the building.
- Use Rytons DamRyt Slim Vent® Protector DAMSLIMVENT to protect the outlet from dust and debris during construction or blockage during rendering.
Important: This is a plastic component and is not suitable for use in the following:
a) external walls of buildings over 11m high where people sleep, whether residential, institutional or hospitality; or
b) external wall surfaces within 1m of a boundary where the building is 11m high or less, in England.
For a compliant alternative, see Rytons A1® Fire-rated Slim Vent® Major with Flyscreen part of Rytons A1® Fire-rated Range.
Size:
103mm L x 66mm H x 10mm W (allows a 6mm venting gap).
CAD drawing available by email.
Free Area:
265mm² per unit.
Colours:
Clear.
Composition:
High impact polystyrene.
Installation:
Installation is fast and easy as work proceeds, with the Slim Vent® replacing the vertical mortar joint.
Lower ventilators should be placed below the DPC, unless cavity trays are used, in which case they should be positioned above the tray. Where vents are installed above and below horizontal fire stops, they should be vertically staggered. See below for spacings.
Reference Material:
- NHBC Standards 6.2 – External timber framed walls
Install every 480mm (approximately every 2nd brick). A drained and vented cavity should be provided to reduce the risk of rain penetration. Where areas are divided by horizontal cavity barriers, openings should be provided to each section equivalent to open brick perpends every 1.2m. This equates to 650mm² free air every 1.2m (approximately 1 × SVFMIN every 480mm or 2nd brick). Proprietary perpend ventilators should be used to provide drainage of the cavity.
- The Building (Scotland) Regulations – Domestic, Section 3.10.6 (Masonry outer leaf)
Install every 1062mm (approximately every 5th brick). Cavities should be vented to external air using ventilators with at least 300mm² free opening area at 1.2m maximum centres. This equates to 1 × SVFMIN every 1062mm or approximately every 5th brick. Cavities should be drained through weep holes where precipitation penetrates the outer leaf.
- British Standards BS 5250
Refer to current guidance for cavity wall ventilation and moisture control.
- Important note
Not all manufacturers’ weep holes provide adequate ventilation. Always check the free air area and verify spacing requirements before installation.
Handling Information:
- Box quantity: 100 number.
- Box size: 26cm W x 22.5cm H x 15cm D.
- Box weight: 2.2kg.
NBS Specification:
Rytons is proud to be a family run business and British manufacturer since 1972
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