Recently purchased a house and discovered that the bathroom cabinets became very hot when the heater came on. Removed the vent cover installed in the front of the bathroom cabinet kickboard to discover that the heater vent came up out of the floor but was never routed over to the vent out of the cabinet. I can't find anything small enough in the local hardware stores to bring the ducting over to the vent. Do I have to cut out the floor of the bathroom cabinet to access the heater vent opening coming up from the crawl space to install the ducting properly? The vent cover is only 3 1/4 inches tall by 13 inches wide.