SVFMIN – Rytons Flyscreened Slim Vent® Minor (Cavity Vent/Weep)

Categories: Cavity and Underfloor Ventilators, Weep Hole Ducts, Weep Hole Ducts and Slim Vents

General Details

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.

Please note: This item is a plastic component and therefore is not suitable for use within a) the external walls of buildings more than 11m high where people sleep on the premises (residential, institutional or hospitality) or b) external wall surfaces within 1m of the boundary if 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.

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Installation:

Installation is fast and easy as work proceeds with Rytons Flyscreened Slim Vent Minor replacing the vertical mortar joint. Lower ventilators should be placed below the DPC unless cavity trays are used, then they should be positioned above the tray. Vertically stagger vents when placing them above and below horizontal fire stops. See below for spacings.

Reference Material:

Install every 480mm or approximately every 2nd brick to NHBC Standards 6.2, External timber framed walls. A drained and vented cavity should be provided to reduce the risk of rain penetrating the frame. Where the 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. That’s 1no SVFMIN every 480mm or approximately every 2nd brick. Proprietary perpend ventilators should be used to provide drainage of the cavity.
Install every 1062mm or approximately every 5th brick to The Building (Scotland) Regulations – Domestic, 3.10.6, Masonry outer leaf. Where the outer leaf is masonry construction, cavities should be vented to the outside air by installing ventilators with at least 300mm² free opening area at 1.2 m maximum centres. This equates to 1no SVFMIN every 1062mm or approximately every 5th brick. Precipitation, i.e. rain, snow and sleet, can penetrate the outer leaf of an external wall and cavities are normally drained through weep holes. These weep holes can also provide the necessary venting.
Also, refer to British Standards BS 5250.
Important: Not all manufacturers’ weep holes have the capability to provide the necessary venting. Check the air space of your weep vent, check your spacing!

Handling Information:

NBS Specification:

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