Further technical information such as composition and manufacture, size and weight, performance and sitework...

Further technical information such as composition and manufacture, size and weight, performance and sitework...

Harmer SML is a proven Agrément Certified system, with over 30 years' use throughout Europe and meets the European Standard EN 877. It is suitable for use above and below ground. Harmer SML significantly reduces noise transmission compared to other pipework systems and is fully compatible with Alumasc’s aluminium roof outlets, floor and shower drains, enabling flexible design solutions for all soil, water and rainwater drainage configurations.

Harmer Roof outlets are available in two ranges: Harmer AV Roof outlets are high performance outlets with circular flanges, suitable for all regular flat roofing applications with continuous membranes. They have spigot or screw connection, for vertical, horizontal or 45º discharge. Harmer Detail roof outlets are for applications such as balconies, gullies and car parks, with two-way outlets available.

For internal drainage solutions, the Harmer Floor drain range combines powder-coated aluminium drain bodies with a full range of stainless-steel or nickel-bronze grates. The range is suited to all types of flooring. Drain bodies are available either trapped or untrapped, with vertical or horizontal spigot connection, and with or without side outlets for connection to sink, bath, shower wastes, etc.

Harmer Shower drains are high-performance outlets for concrete or timber floors in refurbishment and new-build projects. They can be colour co-ordinated and used with flexible sheet or tiled floor finishes.

Size and weight

Harmer SML pipes and fittings are available in diameters from 50 to 400mm.


Harmer SML complies with EN 877 and/or BS 437 as appropriate, and is the subject of BBA Agrément Certificate no. 05/4191, for pipes, couplings and fittings above ground. SML’s acoustic performance has been tested in accordance with BS EN 14366:2004 and achieves an A1 fire classifcation when tested to BS EN 13501-1.


Full technical service, covering all aspects of design, manufacture and installation.

View Soil/waste systems: Harmer SML, Harmer Roof, Harmer Floor, Harmer Shower Product Entry
Harmer Drainage

Harmer Drainage

Alumasc's Harmer range provides a single source for innovative drainage solutions that are designed to perform, engineered to last. For rainwater drainage, Harmer systems provide a total solution from roof outlet to below ground drainage. For...
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 Alumasc Exteriors, White House Works, Bold Road, Sutton, St Helens, Merseyside, WA9 4JG

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