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4.5.5 Direct Vent (Concentric and Twin Pipe): <br /> Termination Clearances <br /> The information below applies to Concentric and Twin Pipe. <br /> TERMINATION Inside © AIR SUPPLY INLET <br /> corner detail <br /> G M VENTTERMINAL <br /> Clearance in <br /> B � ® AREA WHERE TERMINAL <br /> o appelieshes t ts <br /> anticipated _ IS NOT PERMITTTED <br /> D F snow line A . H <br /> E SNOW <br /> 15ft <br /> B <br /> L g <br /> 1__ B <br /> C Fixed V <br /> Operable closed <br /> QFixed V M <br /> closed g <br /> Operable F j-- <br /> V <br /> V ? <br /> —I B A .-1-- K—' <br /> -�i B <br /> Figure 21: Direct Vent Termination Clearances Regulator vent outlet <br /> Table 12 <br /> Canadian Installations' U.S.Installations2 <br /> (CSA B149.1) (ANSI Z223.1/NFPA 54) <br /> Ref Description Direct Vent(Indoor Unit) Direct Vent(Indoor Unit) <br /> A Clearance above grade,veranda,porch,deck,or balcony 12 in. (30 cm) 12 in. (30 cm) <br /> B Clearance to window or door that may be opened 36 in. 91 cm 12 in. 30 cm <br /> C Clearance to permanently closed window <br /> D Vertical clearance to ventilated soffit,located above the terminal within <br /> a horizontal distance of 2 ft(61 cm)from the center line of the terminal <br /> E Clearance to unventilated soffit <br /> F Clearance to outside corner <br /> G Clearance to inside corner 12 in.(30 cm) <br /> H Clearance to each side of center line extended above meter/regulator 3 ft.(91 cm)within a height of <br /> assembly 15 ft. (4.6 m) <br /> I Clearance to service regulator vent outlet 3 ft.91 cm) <br /> J Clearance to non-mechanical air supply inlet to building or the 36 in. (91 cm) 12 in. (30 cm) <br /> combustion air inlet to any other appliance <br /> K Clearance to a mechanical air supply inlet 6 ft(1.83 m) 3 ft(91 cm)above if within 10 ft(3 m) <br /> horizontally <br /> Vents for Category 11 and IV <br /> appliances cannot be located above <br /> L Clearance above paved sidewalk or paved driveway located on public 7 ft(2.13 m)[1] public walkways or other areas <br /> property where condensate or vapor can <br /> cause a nuisance or hazard. <br /> M Clearance under veranda,porch,deck,or balcony 12 in.(30 cm)[2] <br /> Notes: 'In accordance with the current CSA B149.1,Natural Gas and Propane Installation Code. <br /> 21n accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code. <br /> Clearance to opposite wall is 24 in.(60 cm). <br /> [1]A vent shall not terminate directly above a sidewalk or paved driveway that 'Clearances are in accordance with local installation codes and the <br /> is located between two single family dwellings and serves both dwellings. requirements of the gas supplier. (Degagement conforme aux codes <br /> [2]Permitted only if veranda,porch,deck,or balcony is fully open on a d'installation locaux et aux exigences du foumisseur de gaz.) <br /> minimum of two sides beneath the floor. <br /> [3] If locally adopted installation codes specify clearances different than those <br /> illustrated,then the most stringent clearance shall prevail. <br /> Rinnai Tankless Water Heater Installation and Operation Manual 36 <br />