2. NFPA 54 National Fuel Gas Code Boiler Manufacturer ANSI Standards Local Codes Vent Manufacturer

3. Understanding ANSI Standards NegativePositive Non-condensing CondensingVENTING II IIII IV Static Pressure in Vent Above Dew Point Below Dew Point

4. Understanding ANSI Standards NegativePositive Non-condensing CondensingVENTING II IIII IV NFGCAirtight Corrosion Resistant

5. Make sure the equipment and venting system match.

6. Determine the type of equipment installed (Category I, II, III, or IV).

7. Vent category specifies whether the vent system operates under a negative pressure or a positive pressure, and if the products of combustion condense into a liquid in the flue. (ANSI) Vent System Categories

8. IV III II I Appliance Designation Atmospheric  Draft Diverter Fan Assisted Negative Positive Non-Condensing Condensing Forced Draft Fan Assisted

9. Check that the proper venting material is used (B-vent, pressure stack, AL29-4C etc.).

10. IV III II I Forced Draft  UL103 P-Stack  Welded Steel Atmospheric  B-Vent  Masonry Fan Assisted  B-Vent  Masonry (interior) Acceptable Vent Material  AL29-4C double wall Fan Assisted (86 – 90 % efficiency) Condensing (90+ efficiency)  AL29-4C single wall  CPVC (tested with appliance) (85 – 90 % efficiency)  AL29-4C double wall Direct Vent  AL29-4C double wall

11. Check appliance draft requirements. Codes require that the draft must meet the manufacturers specifications.

12. -0.05” -0.06” -0.08” -0.02” -0.03” -0.03” 0.00” -0.01” -0.01” -0.14” -0.17” -0.20” 20’ 6’ 10’ 50’ 1,000 MBH Fan Assist Cat. I (10” B-Vent) 95°F 60°F 25°F Chimney Pressures - Steady State

13. Vertical Venting with a Metal Chimney System and Inside Air Futera II Category I

14. Futera III Category II

15. Modulating Boiler System Blr 1 starts Blr 2 starts Blr 3 starts Blr 4 startsBlr 2 stopsBlr 3 stopsBlr 4 stops Vent = 30’ vert./10’ horiz., 18” diam. 4 Fan-assisted Cat I boilers with 1,000 MBH input each Constant ambient of 60°F Draft variations in a modulating boiler system

16. Barometric Dampers Draft Hoods and Barometric Dampers will maintain the boiler’s operating efficiency, but now excess air will be needed to be pulled into the equipment room. –Consider automatic dampers, or a –Modulating exhaust system, or –Modulating dampers

17. Horizontal Vent using Inside Air Futera II Category I

18. Side Wall Venting using Inside Air Futera II Category III

19. Z223.1-51-2002 (Venting of Equipment) 10.3.4.6 Mechanical Draft Systems. The exit terminals of mechanical draft systems shall be not less than 7ft above grade where located adjacent to public walkways. Public Walkway Not less than 7’ Side wall venting

20. Z223.1-56 (Venting of Equipment) 7.8 Venting System Location. (a) A Venting system shall terminate at least 3 ft (0.9 m) above any forced air inlet located within 10 ft (3.1 m). Exception No. 1: This provision shall not apply to the combustion air intake of a direct-vent appliance. Exception No. 2: This provision shall not apply to the separation of circulating air inlet and flue gas discharge of listed outdoor appliances. Forced Air Inlet If Less than 10’ 3’ Min. Side wall venting Alexander Conca

21. Z223.1-56 (Venting of Equipment) 7.8 Venting System Location. (b) The venting system of other than a direct-vent appliance shall terminate at least 4 ft (1.2 m) below, 4 ft (1.2 m) horizontally from, or 1 ft (30 cm) above any door, window, or gravity air inlet into any building. The bottom of the vent terminal shall be located at least 12 in. (30 cm) above grade. Gravity Air Inlet Gravity Air Inlet 4’ Min. 12” Min. 4’ Min. Side wall venting

22. Z223.1-56 (Venting of Equipment) As required for Clearance to Combustibles or Snow Load. As required for Clearance to Combustibles Parapet Roof Rooftop venting 2 feet above anything within 10 feet & no less than 3 feet above roof

23. Common Code Violations NFPA 54 c99 Sec. 7.6.1(d) The total horizontal distance of a vent plus the horizontal vent connector serving Category 1 appliances Shall Not Be Greater Than 75% of the vertical height of the vent.

24. Common Code Violations NFPA 54 c99 Sec. 10.2.2,4,5 The length of the common vent connector, offset, and breeching Shall Not Exceed 1 1/2 ft. (18”) for each inch of common vent diameter. Diameter Not Greater than 1.5 Ft. per Every Inch of Diameter

25. Common Code Violations NFPA 54 c99 Sec. 10.2.8, 15 The flow area of the vertical vent Shall Not Exceed Seven (7) Times the flow area of the smallest listed appliance. Not Greater than 7 times the smallest Outlet Cross Sectional Area Smallest Diameter

26. Common Code Violations NFPA 54 Z223.1 Connector Rise Not Adequate for Breeching Diameter Riser 3 Ft. Minimum Vertical Rise on 8900 Units 5 Ft. Minimum Vertical Rise on 8800 Units

27. Common Code Violations NFPA 54 v99 Sec. 7.10.4(b) Vent Connectors serving equipment vented by natural draft Shall Not Be Connected Into Any Portion of mechanical draft systems under positive pressure.

28. Common Code Violations NFPA 54 c99 Sec. 7.3.4(b) Forced draft systems and all portions of induced draft systems under positive pressure shall be designed and installed so as to prevent leakage of flue gasses into the building.

29. Combustion Air Make sure the proper amount of combustion air is available.

30. Air from Outside or Inside the Building NFPA 54 - National Fuel Gas Code, Outside Air for Combustion National Fire Protection Association, NFPA Gas fuels: Minimum No. openings required2 Indoor opening, sq. in./Btu h 1/1000 Outdoor opening, sq. in./Btu h1/4000 Vertical ducts, sq. in./Btu h1/4000 Horizontal ducts, sq. in./Btu h1/2000 Ducts same as openingyes Louver & grill free area opening CFM per 1000 BTU’s (atmospheric).50 CFM per 1000 BTU’s (fan assist) without barometric.27 with barometric.35 - Single Outdoor opening: 1/3000