59VVA12326NOTE: The following is based upon National codes for gas appliances and is provided as a reference.Refer to local codes which may supersede these standards and/or recommendations.Item Clearance Description Canadian Installations (1 )(per CAN/CSA B149.1)U.S. Installations (2 )(per ANSI Z223.1/NFPA 54)A Clearance above grade, veranda, porch, deck, balconyor anticipated snow level12 in. (305 mm)18 in. (457 mm) above roof surface. 12 in. (305 mm)B Clearance to a window or door that may be opened12 in. (305 mm) for appliances >10,000 Btuh (3 kW)and =100,000 Btuh ( 30 kW),36 in. (914 mm) for appliances >100,000 Btuh (30 kW)9 in. (229 mm) for appliances >10,000 Btuh (3 kW)and = 50,000 Btuh ( 15 kW),12 in. (305 mm) for appliances >50,000 Btuh (15kW)C Clearance to a permanently closed windowFor clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B149.1, clearances shall be in accordance with localinstallation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.Manufacturer’s Recommendation: See Notes 3-8.DVertical clearance to a ventilated soffit located abovethe terminal within a horizontal distance of 2 feet (61cm) from the centerline of the terminalE Clearance to an unventilated soffitF Clearance to an outside cornerG Clearance to an inside cornerH Clearance to each side of the centerline extended aboveelectrical meter or gas service regulator assembly3 ft. (.9 M) within 15 ft. (4.6 M)above the meter/regulator assembly.3 ft. (.9 M) within 15 ft. (4.6 M)above the meter/regulator assembly.I Clearance to service regulator vent outlet 3ft. (.9 M) See Note 4.J Clearance to non—mechanical air supply inlet to buildingor the combustion air inlet to any other appliance12 in. (305 mm) for appliances >10,000 Btuh(3 kW)and = 100,000 Btuh ( 30 kW),36 in. (914 mm) for appliances >100,000 Btuh (30 kW)9 in. (9 mm) for appliances >10,000 Btuh (3 kW)and = 50,000 Btuh (15 kW),12 in.(305 mm) for appliances >50,000 Btuh (15kW)K Clearance to a mechanical air supply inlet 6 ft. (1.8 M) 3ft. (.9 M)L Clearance under a veranda, porch, deck, or balcony12 in. (305 mm).Permitted only if veranda, porch, deck, or balcony is fully open on aminimum of two sides beneath the floor.See Note 4.Manufacturer’s Recommendation: See Notes 3-8.MClearance to each side of the centerline extended aboveor below vent terminal of the furnace to a dryer or waterheater vent, or other appliance’s direct vent intake orexhaust12 in. (305 mm) 12 in. (305 mm)NFurnace combustion air intake clearance to a waterheater vent, dryer vent or other types of applianceexhaust.3 ft. (.9 M) 3 ft. (.9 M)0 Clearance from a plumbing vent stack 3 ft. (.9 M) 3 ft. (.9 M)P Clearance above paved sidewalk or paved drivewaylocated on public property7 ft. (2.1 M)Vent shall not terminate above a sidewalk or paved driveway that islocated between two single family dwellings and serves bothdwellings.See Note 4.Manufacturer’s Recommendation: See Notes 3-8.> greater than, ≥ greater than or equal to, < less than, ≤ less than or equal toNotes:1 In accordance with the current CAN/CSA B149.1, Natural Gas and Propane Installation Code.2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code3 NOTE: This table is based upon National codes for gas appliances, and are provided as a reference.Refer to Local codes which may supersede these standards and/or recommendations.4 For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B 149.1, clearances shall be in accordance with local installation codes and the requirementsof the gas supplier and the manufacturer’s installation instructions.5 When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combustionproducts of adjacent vents. Recirculation can cause poor combustion, inlet condensate problems, vent termination icing, and/or and accelerated corrosion of theheat exchangers.6 Design and position vent outlets to avoid ice build-up on and moisture damage to surrounding surfaces.7 The vent for this appliance shall not terminate:a. Near soffit vents of crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage; orb. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.8 Avoid venting under a deck or large overhang. Recirculation could occur and cause performance or system problems. Ice build-up may occur.Fig. 46 -- Direct Vent Termination Clearance59TP6A