4 Inch 'No Resist' Back Draught Grille - Brown
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100MM ENERGYSAVER WALL KIT WHITE
National Ventilation ESG4BR
The National Ventilation Energysaver cowl (external grille) is one of the most effective external extractor fan grilles available on the market. It counteracts the detrimental effects caused by wind which dramatically affects the extraction and performance levels of extractor fans. In turn it makes the fan more energy efficient compared to standard fixed or gravity grilles.
Whilst increasing performance it also helps eliminate back draughts which are common when an extractor fan is switched off. We recommend the use of duct clamps with all ducting and grilles.
*Please note that these grilles are not suitable for a soffit installation*