Jason from Ardent Heating, air Conditioning & water Treatment Specialists located in Barrie Ontario gives a demonstration of why a 5 inch furnace filter is much better to use on your furnace than a 1 inch for reasons such as reducing furnace repairs, furnace efficiency, as well as central conditioner repairs and service More info: http://www.ardentcanada.com (705) 721-HEAT 653 DUNLOP ST.W BARRIE, ONTARIO