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1. Appliances . Carefully review the appliance manufacturer’s installation instructions for positioning the unit, any special venting or connector requirements, and verify that it is a Category I appliance or an appliance that requires the use of Type B gas vent. 2. Placement . The placement of the vent and fittings must be in accordance with Local Codes, as well as accepted venting practices. If more than one appliance is to be connected to one venting system, the common vent must be correctly sized. It is a good idea to make a sketch of the proposed installation, labelling the components you will need. Adjustable Pipe Lengths are available to make up odd lengths. Minimize the number of turns and lateral runs, as the National Fuel Gas Code places limitations on these. A 45° turn is preferable to a 90° turn. The appliance reference material should be consulted at this time, as well as any Local Authority having jurisdiction. In most localities, building permits are required for any new appliances, or modifications to existing venting systems.
3 3. Figures 1 , 2, & 3 show examples of some typical residential installations . 4. Clearance to Combustibles . A 1-inch clearance (air space) to combustible materials must be maintained , when using Simpson Dura-Vent Round B- Vent, regardless of the pipe diameter. 5. Combustion Air . Refer to appliance installation instructions and local building codes to ensure compliance with required volume of combustion air for each appliance installed . 6. Slope . If the venting system contains lateral (horizontal) components, they shall be positioned so they have an upwards slope away from the appliance of not less than 1/4- inch rise per foot of run. (Horizontal vent installed in attics, unconditioned area, or between floors have further restrictions, please consult your local building codes for specific limitations.)
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GAS VENT INSTALLATION INSTRUCTIONS
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