Greenwood Acoustic MA3051 airflow-filters-cat-10 adjust the level of humidity

adjust the level of humidity that activates the fan and you can also turn off the humidity function

'X' suffix models also have powered electric anti-backdraught shutters 258512

used to catch small and often invisible particles such as pollen spore bacterium and dust are also available - see model reference 90000323

pet dander

mould & plant spores

Greenwood Acoustic MA3051 airflow-filters-cat-10 adjust the level of humidityGreenwood Acoustic MA3051 wall ventilator in white providing acoustic attenuation to Dn,e,w 55dB(A), suitable for external wall thicknesses of 140mm and above and can be installed in internal wall constructions of between 100 150mm. Equivalent performance 2500mm2. Supplied with internal controllable vent and white sand external grilles. Conforms to acoustic requirements of Noise Insulation Regulations (NIR) 1975, one of only a small number of products