An image of a Manthorpe GILSV25-20 In Line Slate Vent with a Flexi Pipe

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Manthorpe Small Format In-Line Slate Vent - GILSV25-20

Name: Manthorpe Small Format In-Line Slate Vent - GILSV25-20
Brand: Manthorpe
SKU: MANLOFT-GILSV25-20
Price: 32.4 GBP
Availability: InStock

by Manthorpe

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£32.40 - £45.67

£32.40

£32.40 - £45.67

£32.40

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

Manthorpe Small Format In-Line Slate Vent - GILSV25-20

The small format in-line slate ventilator is a low profile, unobtrusive solution to ventilation requirements through a roof covered with slates up to 500x250mm in size. The integral pipe outlet is perfect for extraction and requires no additional adaptor. The vents flat profile with it’s lightly textured finish helps to maintain an unbroken appearance to the roofline whether used at high or low level. The tortured path through the 4mm louvred grill and internal weathering geometry is designed to maintain airflow whilst channelling any water ingress out of the vent and on to the roof covering. The vent can be used with 500 x 250mm sizes slates down to 400 x 200mm coverings and various sizes in between

Features & Benefits

6,000mm²/m of free vent area per unit
Discreet, in-line design
For use with 500 x 250mm down to 400 x 200mm format slates
Built in spigot, no need for an adaptor
Suitable down to 22.5° roof pitch @ 500 x 250mm
Protective edge skirt improves weatherproofing
Independently wind tunnel tested at the BRE
Free Vent Area - 6,000mm²
BRE Wind Tunnel Test Report No - P107103-1000
Material - Polypropylene
Manufacturing Process - Injection Moulded

Buyer 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).