Hay fever is believed to affect over 10 million people in the UK and can be an annual visitor or afflict people for a shorter time. It is an allergy caused by pollen or dust which inflames the mucous membranes of the eyes and nose, causing a runny nose and watery eyes.

Research by the Royal College of General Practitioners revealed a 114 per cent increase in people visiting their GP with hay fever symptoms in 2014, as more people took action against the seasonal condition. It is therefore hardly surprising that EnviroVent has seen a rise in sales of its ventilation systems that may help to relieve the symptoms of hay fever and other allergies.