Vents shall terminate not less than 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood outlet or flue collar.
Exceptions:
1. Venting systems of direct vent appliances shall be installed in accordance with the appliance and the vent manufacturer' s instructions.
2. Appliances listed for outdoor installations incorporating venting means shall be installed in accordance with their listings and the manufacturer's installation instructions.
3. Pellet vents shall be installed in accordance with the appliance and the vent manufacturer's installation instruction.