Premium Furnace Filters in Calgary: Let's Compare MERV Ratings & Types We spend many of our hours at home, reading, cooking, taking showers, or just relaxing. Healthy and clean indoor air is a MUST! If the air in your home feels musty and you find yourself with frequent allergies due... Premium Furnace Filters in Calgary: Let's Compare MERV Ratings & Types We spend many of our hours at home, reading, cooking, taking showers, or just relaxing. Healthy and clean indoor air is a MUST! If the air in your home feels musty and you find yourself with frequent allergies due...