Keep your heat recovery ventilator running well with Nu-Air replacement filters. This filter replacement delivers 85% average arrestance. This speaks to how well it removes larger particles of dirt, lint, hair and dust from the air. The filter has a high dust-holding capacity of 75 grams per square foot. For improved health and safety, it is also antimicrobial and non-carcinogenic. You can cut this filter to fit any Nu-Air HRV/ERV model as well as the majority of competitive models.