VENTING SYSTEM FOR CATEGORY II, III, AND IV APPLIANCES PRESSURE VENT INSTALLATION INSTRUCTIONS
A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE THAT DOUBLE WALL PRESSURE VENT BE INSTALLED ONLY IN ACCORDANCE WITH THESE INSTRUCTIONS. NOTE: Dear Customer, Installer, or End User: Read through all of these instructions before beginning your installation.
INTRODUCTION DuraVent manufactures a special vent system for gas fired appliances as a category II, III and IV venting system in the USA and Canada as BH venting system . For continuous operating exhaust temperature (see table 1) pressure of 6" water column. Pressure vent must be installed by an experienced installer familiar with the operation and maintenance of heating appliances and venting. Failure to follow proper installation procedures may cause unsafe conditions.
UNIT HEATER APPLIANCES HORIZONTAL INSTALLATION: Horizontal commercial applications are for buildings which are not attached to living spaces. When venting through a sidewall termination residential or commercial the system shall be not less than 12" (.3m) above the ground and 12" above the highest snow fall. Terminate the system at least 7’ (2.1 m) above a public walkway or driveway and less than 6’ (1.8 m) from the combustible intake of any appliance and no less than 3’ (.
the chimney. Complete kits are avaliable (Tee, Top Plate, and Flex). Connect only one appliance per chimney liner. The size of the liner should be the same as the appliance outlet. See complete flexible chimney liner instructions L253 – www.duravent.com/productdocumentsearch.aspx Pressure Vent Into Masonry Chimney TO ASSEMBLE DURAFLEX LINER Attach tee without branch to liner flex then wrap insulation around liner (see example), then lower liner down masonry chimney to the thimble area.
