An image of a Manthorpe Hooded Slate vent, previously known as an Alpha Vent

An image of the side of a Manthorpe Hooded Slate vent, previously known as an Alpha Vent

An image of a Manthorpe Hooded Slate vent installed onto a roof to show what it would look like.

An image of a Manthorpe Hooded Slate vent with the dimensions to show the size.

An image of a Manthorpe Hooded Slate vent, previously known as an Alpha Vent and also the flexi pipe that is compatible with it.

Manthorpe Small Hooded Slate Vent - GRSV30/25

Name: Manthorpe Small Hooded Slate Vent - GRSV30/25
Brand: Manthorpe
SKU: MANTSLVENT-250-300
Price: 13.14 GBP
Availability: InStock
Rating: 5.0 (1 reviews)

by Manthorpe

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£13.14 - £26.87

£13.14

£13.14 - £26.87

£13.14

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Manthorpe has been designing and developing innovative building solutions for the UK construction industry for 40 years.

Manthorpe Hooded Slate Vent - GRSV30/25

The Manthorpe Alpha Slate Vent (GRSV30/25) can be used for high or low level roof ventilation. With the addition of a compatible flexible pipe, the vent can also be used for convenient bathroom or soil extract.

Ideal for quick, discreet installation, use this vent in place of a single, 600 x 300mm roof slate. This vent is also marked with trim lines, allowing it to be cut down for use with 500 x 250mm slates.

Made from UV resistant Polypropylene, the GRSV30/25 Slate Vent passes 10,000mm2 of airflow through an insect-proof grille. The unit has an oval spigot on the reverse for direct ventilation to the loft space or connection to mechanical extract.

Features & Benefits

Cheap, easy roof vent installation in place of a standard 600 x 300 or 500 x 250 roof slate
Use built-in spigot for direct, loft-space ventilation at high or low level
Attach a Manthorpe GRPA flexible pipe for soil or mechanical extract ventilation
Features a 4mm grille to exclude flies, twigs, and leaves
Manufacture: Polypropylene (injection moulded)
Brand: Manthorpe
Product Code: GSRV30/25
Size: 600 x 300mm (can be trimmed to 500 x 250mm)
Weight: 700g
Colour: Black
Free Airflow: 10,000mm2
Standards: BS 5250, BS 5572, BS 6367, BRE Digest 262/270, NHBC 7.2, UK Building Regulations Part F2
Fully recyclable

Buyer's Notes

Product Information Sheet

Fitting Instructions

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Why Choose Manthorpe?

Our comprehensive range of quality building products is designed to meet your every need, from groundwork to roofline, from new build to refurb.

With extensive experience in the plastics industry, we have the expertise to manufacture virtually all our building products in-house and continue to invest heavily in new technology, cutting edge machinery and production processes.

Our products are proudly British made, providing our customers with full confidence in their high quality and robustness, and removing any supply chain concerns. Our close relationships with independent and national merchants ensure that our building products are available to purchase from a wide range of outlets throughout the UK.

At Manthorpe Building Products, they don’t just manufacture — they design, innovate, and deliver solutions that make building better. For over 40 years, they’ve been helping housebuilders and contractors tackle everyday challenges with smart, sustainable products that work.

From roofing essentials to through-wall and underfloor systems, cavity trays and closers, biodiversity products, radiator pipe guides and seals, loft doors, access panels, and drainage solutions — they’ve got the details covered so homes perform at their best.

British made for over 200 years

At the heart of our business is a shared culture built on collaboration, respect, and continuous improvement. We’re proud to foster a diverse and inclusive workforce where every individual is empowered to contribute, take initiative, and drive positive change. Always operating with health, safety, and wellbeing in mind — creating an environment where people feel supported and protected. Our values are reflected in the way we work together, with accountability, and always seeking smarter solutions - strong foundations for long-term partnerships and sustainable growth.

Independently Tested to BS 8612

Following the increased use of dry fix systems courtesy of these updates to BS 5534, a brand-new standard BS 8612 was introduced in February of 2018 to better control the design and material construction of dry fix systems. Manthorpe’s range of dry fix products have been independently tested to conform with the requirements of BS 8612, performance data for the tests conducted on these products is available upon request.

By far the simplest, quickest, and most cost-effective way of complying with the new standard is to join the switch to dry fix methods of roofing. Manthorpe's dry fix systems provide a high performance, easy to fix and maintenance free solution which can not only speed up the job on site, but also offer long term financial benefits.

40 Years of Expertise

Manthorpe has been designing and developing innovative building solutions for the UK construction industry since 1985

140+Skilled People

Our team is driven by experience and a passion for creating products that make construction easier, safer, and greener

64.5% Recyclate Content Achieved

In 2023, we achieved a recyclate content of 51% of total tonnage used in our manufacturing processes.

Together, we create sustainable living

We’re proud to foster a diverse and inclusive workforce where every individual is empowered to contribute, take initiative, and drive positive change.

The Bat Ridge Roost provides a habitable roost space for small crevice-dwelling bat species found in the UK.

Designed in association with the Bat Conservation Trust as part of their Roost Partnership scheme the product is a self-contained, externally mounted unit which offers no means of access for the bats to enter the roof space or the property. The Bat Ridge Roost also acts as a ridge end cap and is optimised to work in conjunction with the Manthorpe SmartVerge Polypropylene handed and ambidextrous dry verge systems (alternatively, could also be used with third party dry verge, traditional verge tiles or mortared in verge details).