Natural Ventilation Radiators

Mounting Your Inlet Behind a Radiator...

Naturalvent and your radiator manufacturer will work together to provide a unique solution for your heating and ventilation requirements...

Dunham Bush

Naturalvent, in conjunction with Dunham Bush radiator manufacturers, can provide you with the perfect accompaniment to your natural ventilation system. By installing a radiator under an inlet the incoming cool air can be warmed, preventing cold draughts while maintaining adequate ventilation levels. The radiator can also become part of your overall control system, allowing even more flexibility and control over the room’s comfort level.

Introduction
Dunham-Bush Warmsafe II LST radiators are designed to provide comfort heating in applications where safety is paramount. The heat emitter is totally enclosed within the LST casing with inlet and outlet grilles designed to exclude ‘small hands’. The mainly convective heat output promotes good room air circulation and ensures ‘cool casing touch temperatures’, which conform to the NHS Estates health guidance note on ‘safe hot water and surface temperatures’.

Authority
It is accepted practice and policy at Dunham-Bush to maintain exceptional standards in engineering and quality. To this end Dunham-Bush operates a quality system and is registered as a firm of assessed capability to BS EN ISO 9001 : 2000

Composition
Each Warmsafe II LST comprises a casing fabricated from 1.6mm thick mild steel sheet coated in RAL 9010 white polyester powder. The top casing outlet comprises an extruded aluminium grille and the bottom inlet is provided by integral punched slots in the casing. Mild steel back-plates, coated in matt black polyester powder, suspend both emitter and casing on the wall surface. Knockouts are provided in each casing for top/bottom and opposite/same end connections, with a white nylon bezel to finish around the TRV adjuster. Emitters are available in two types - E1 for 90mm thick casings and E2 for 150mm casings. Warmsafe II LST casings are also available in special finishes, to any colour and gloss level from the RAL and BS4800 range of colours.

Range
Warmsafe II LST radiators are offered in a comprehensive range of sizes. There are two types of casing: 75mm deep (for single row element) and 135mm deep (for double row element). Casing heights are 600mm with lengths ranging from 500mm up to 2400mm.

Elements
Each element shall be supplied with fins having formed collars to ensure maximum heat transfer between fins and tube. The fins shall be bonded to the tube by mechanical expansion of the tube. The element comprises of 22mm O.D. copper tube with aluminium fins having a minimum thickness of 0.35mm.

General
Warmsafe II LST radiators are the ideal heat emitters for applications where safety is the first consideration. Each size can be selected and specified with confidence of satisfying criteria for low-surface temperature requirements. The low surface temperature casing has safe radiused corners with no sharp edges, but is robust and finished in a durable“soft” white polyester powder coating.

Heating media
Warmsafe II LST radiators are designed for applications where it is critical to prevent long-exposure time burns. Warmsafe II LST is designed for low temperature hot water (LTHW) as the heating media (typically 80°C flow and 70°C return).

The use of medium temperature hot water (MTHW) is not recommended, as casing surface temperatures will exceed NHS and HSE recommended values.

Engineering Specification
Warmsafe II LST radiators shall be manufactured by Dunham- Bush Ltd to the selection schedule and/or drawings. The construction shall comply with the following specification. Casings shall be manufactured in 1.6mm thick mild steel, formed to a smooth finish free from sharp edges.

Slots shall be punched in the bottom for air inlet and an extruded aluminium ‘Shadowline’ grille shall be fitted to the top for air outlet. Casings shall be supplied with backplate with pre-punched holes for emitter bracket fixing.