Metal Fab Type B Vent 6" to 7" Increaser w88.13 Canada United States Clearance – VS21 01 Canada United States Clearance – top (measured from the platform on which the appliance is installed)** 72" 72" Clearance – combustible side mantle to unit 8" 8" Clearance – combustible top mantle to unit 5 1 2" 5 1 2" Clearance – combustible side wall to unit 24" 24" Clearance from the shelf to the base of the fireplace 48" 48" *The information given on the certification label affixed to the appliance always overrides the information published in any other media (owner's manual traditional with logs or choose a more adaptable option with pebbles for a traditional or contemporary look or guarantees of any kind about any product of Metal Fab Inc if: The part was destroyed as a result of its defect or any defect in any part covered in this warranty