Zehnder brand ISO Coarse ≥ 45 % (G3) polyester filter cones should be fitted to every return valve, (bathrooms, kitchens, laundries) to protect ducting from the accumulation of dust and grease. These filters should be cleaned or replaced every 6 months. Cones are machine washable but will eventually require replacement. Video here on how to change these.
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Zehnder brand ISO Coarse ≥ 45 % (G3) polyester filter cones should be fitted to every return valve, (bathrooms, kitchens, laundries) to protect ducting from the accumulation of dust and grease. These filters should be cleaned or replaced every 6 months. Cones are machine washable but will eventually require replacement. Video here on how to change these.
Zehnder brand ISO Coarse ≥ 45 % (G3) polyester filter cones should be fitted to every return valve, (bathrooms, kitchens, laundries) to protect ducting from the accumulation of dust and grease. These filters should be cleaned or replaced every 6 months. Cones are machine washable but will eventually require replacement. Video here on how to change these.
