Sizing Guide - Type B Gas Vent for Category 1 Appliances - All-Fuel Chimney for Oil-Fired Appliances & Open-Face Fireplaces
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Table of Contents Page Section 1 Type B Double-Wall Gas Vent Systems General Rules Types of Systems and Definitions Single-Appliance Vents Section 2 4 7 8 Multiple-Appliance Vents 13 Multiple-Story Venting 19 Factory-Built All-Fuel Chimney Systems www.hartandcooley.
Foreword This Guide is a compilation of the system design and application procedures for all Hart & Cooley® Gas Venting and Chimney products. The first section is specifically devoted to the design of Double-Wall Type B Gas Vent Systems for use with equipment certified by the American Gas Association or Canadian Gas Association for use with B Vent.
1 Type B Double-Wall Gas Vent Systems General Rules Types of Systems and Capacity Tables Single-Appliance Vents Multiple-Appliance Vents Multiple-Story Venting 3
Type B Double-Wall Gas Vents Type B Systems The Tables given in Section 1 apply to system design using Hart & Cooley® Type B Gas Vents and to Model TLC Chimneys when used for venting listed Category I gasfired, draft-hood-equipped or fan-assisted combustion appliances. At no time should a venting system for a listed Category II, III, or IV appliance be sized with these tables; instead, follow the appliance manufacturer’s instructions.
a. 1 inch2/3000 Btu/hour of the total input rating of all equipment located in the enclosure, and b. Not less than the sum of the areas of all vent connectors in the confined space. A combination of air supplied from both the indoors and outdoors is also permitted. See NFPA 54 for these provisions. Local Building Code Should the local building code differ from recommendations given in this Guide, consult with your building inspector or other local administrative authority.
Type B Double-Wall Gas Vents Condensation The condensing of water vapor from the products of combustion of gas fuels can be minimized with the use of these sizing tables. When the vent system is designed properly, dilution air, which may enter a draft hood (if available), reduces the temperature at which water vapor will condense (dew point). Exceptions that will cause condensation are as follows: A.
Metal Cap Terminations Cap sizes 14" through 30" diameters are for gas vents that extend at least 2 feet above the highest point where they pass through a building and at least 2 feet higher than any portion of the building within 10 feet. If any adjacent structures are within 10 feet of the vent and are higher, then the vent MUST terminate at least 2 feet above these structures. This recommendation should be followed unless local code requirements state otherwise.
Type B Double-Wall Gas Vents FAN MAX refers to the maximum input rating of a Category I fan-assisted appliance attached to the vent. NAT MAX refers to the maximum input rating of a Category I draft-hood-equipped appliance attached to the vent. There are no minimum appliance input ratings for draft-hood-equipped appliances. FAN+FAN refers to the maximum combined input rating of two or more fan-assisted appliances attached to the common vent.
How to Use Single-Appliance Vent Tables To determine the proper vent size for a single-appliance vent, use Table 1 or 2 (pages 10-12). • Determine Total Height (H) and Total Lateral Length (L) based on location of appliance and vent and the height to vent termination. • Read down the Total Height (H) column at the left to a height equal to the Total Height. • Select the horizontal row for the appropriate Length of Lateral (L) (zero for straight vertical vents).
Type B Double-Wall Gas Vent Capacities with Type B Double-Wall Connector Single Category I Appliance Table 1 Vent and Connector Diameter - D Vent 3" 4" Height Lateral H L FAN FAN NAT (ft) (ft) Min Max Max Min Max 6 0 0 78 46 0 152 2 13 51 38 18 97 4 21 49 34 30 94 6 25 46 32 36 91 8 0 0 84 50 0 165 2 12 57 40 16 109 5 23 53 38 32 103 8 28 49 35 39 98 10 0 0 88 53 0 175 2 12 61 42 17 118 5 23 57 40 32 113 10 30 51 36 41 104 15 0 0 94 58 0 191 2 11 69 48 15 136 5 22 65 45 30 130 10 29 59 41 40 121 15 35 53 3
1 Table 1 (continued) Vent and Connector Diameter - D Vent 12" Height Lateral H L FAN (ft) (ft) Min Max 6 0 0 1645 2 103 982 4 147 975 6 171 967 8 0 0 1858 2 98 1124 5 154 1110 8 180 1097 10 0 0 2036 2 93 1244 5 149 1229 10 187 1204 15 0 0 2380 2 86 1495 5 140 1476 10 177 1446 15 202 1418 20 0 0 2637 2 81 1694 5 135 1674 10 172 1641 15 195 1609 20 217 1578 30 0 0 3004 2 74 2004 5 127 1981 10 164 1944 15 187 1908 20 207 1873 30 246 1807 50 0 0 3441 2 66 2431 5 118 2406 10 154 2366 15 177 2327 20 195 2288 30
Type B Double-Wall Gas Vent Capacities with Single-Wall Connector Single Category I Appliance Table 2 Vent and Connector Diameter - D Vent 3" Height Lateral H L FAN NAT (ft) (ft) Min Max Max 6 0 38 77 45 2 39 51 36 4 NA NA 33 6 NA NA 31 8 0 37 83 50 2 39 56 39 5 NA NA 37 8 NA NA 33 10 0 37 87 53 2 39 61 41 5 52 56 39 10 NA NA 34 15 0 36 93 57 2 38 69 47 5 51 63 44 10 NA NA 39 15 NA NA NA 20 0 35 96 60 2 37 74 50 5 50 68 47 10 NA NA 41 15 NA NA NA 20 NA NA NA 30 0 34 99 63 2 37 80 56 5 49 74 52 10 NA NA NA
Multiple-Appliance Vent Systems How to Determine Each Vent Connector Size (Table 4A or 5A, pages 14-16) • Determine the MINIMUM TOTAL VENT HEIGHT for the system from a sketch of the proposed system. • Determine the CONNECTOR RISE for each appliance. • Enter the VENT CONNECTOR Table 4A or 5A at the line showing VENT HEIGHT equal to or less than that determined above. Continue horizontally on that line for the first appliance CONNECTOR RISE using the appliance nameplate BTUH rating (sea level).
Type B Vent Connector Capacities For Multiple Category I Appliances Connected to a Common Vent Table 4A Vent Height H (ft) 6 8 10 15 20 30 50 100 Vent Connector Diameter - D Connector 3" 4" 5" 6" 7" 8" Rise Appliance Input Rating Limits in Thousands of BTU Per Hour R FAN FAN FAN FAN FAN FAN NAT NAT NAT NAT NAT (ft) Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max 1 22 37 26 35 66 46 46 106 72 58 164 104 77 225 142 82 296 2 23 41 31 37 75 55 48 121 86 60 183 124 79 253 168 95 333
1 Table 4A (continued) Vent Height H (ft) 6 8 10 15 20 30 50 100 Connector Rise R (ft) 2 4 6 2 4 6 2 4 6 2 4 6 2 4 6 2 4 6 2 4 6 2 4 6 Vent Connector Diameter - D 12" FAN Min Max 174 764 180 897 NA NA 186 822 192 952 198 1050 196 870 201 997 207 1095 214 967 221 1085 228 1181 223 1051 230 1162 237 1253 216 1217 223 1316 231 1400 206 1479 213 1561 221 1631 192 1923 200 1984 208 2035 14" NAT Max 496 616 NA 516 644 772 536 664 792 568 712 856 596 748 900 632 792 952 689 860 1031 712 888 1064 FAN Mi
Single-Wall Vent Connector Capacities For Multiple Category I Appliances Connected to a Common Vent Table 5A Vent Connector Capacity Vent Height H (ft) 6 8 10 15 20 30 50 100 Vent Connector Diameter - D Connector 3" 4" 5" 6" 7" 8" Rise Appliance Input Rating Limits in Thousands of BTU Per Hour R FAN FAN FAN FAN FAN FAN NAT NAT NAT NAT NAT (ft) Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max 1 NA NA 26 NA NA 46 NA NA 71 NA NA 102 207 223 140 262 293 2 NA NA 31 NA NA 55 NA NA 85 1
Additional Guidelines for Multiple-Appliance Venting Additional Guidelines for Multiple-Appliance Venting When common-venting, connector Tables 4A and 5A allow for connector lateral lengths of 1½ feet (18 inches) for each inch of connector diameter as follows: Use available headroom for maximum connector rise Always use available headroom for maximum connector rise after allowing for the listed clearance to combustibles.
Type B Double-Wall Gas Vents When in doubt use one size larger vent It is neither possible nor practical in some cases to anticipate all installation or operational contingencies in designing a vent system. A safe rule is, when in doubt use one size larger connectors and common vents than required by the Vent Tables. LEAST PREFERRED 3-FT. RISE 3-FT. RISE 3-FT.
Tapered INCORRECT Use total heat input to each portion of manifold under construction, using V capacities with a 10% reduction from Common Vent Table at total vent height. CEILING TOO M UCH SL OPE SUFFICIENT RISE 1 2 3 5 4 INSUFFICIENT CONNECTOR RISE WILL CAUSE SPILLAGE ON NO. 5 AND POSSIBLY ON NO.
CAUTION: It is important to keep the following points in mind. • Common vent height must always be computed as the distance from the outlet of the connected appliance to the lowest part of the opening from the next interconnection above. • If the connector rise is inadequate, increase connector size, always making sure of maximum available connector rise. • Be sure that the air supply to each appliance is adequate for proper operation.
1 APPROVED TOP USE INDIVIDUAL VENT FOR TOP-FLOOR APPLIANCE IF CONNECTOR REQUIREMENT FOR RISE OR TOTAL HEIGHT CANNOT BE MET (Table 1 or 2) USE TOTAL HEIGHT FOR TOP-FLOOR APPLIANCE AND COMBINED INPUT OF ALL APPLIANCES ON COMMON VENT (Table 4B or5B) TOTAL HEIGHT FOR TOP-FLOOR APPLIANCE THIRD INTERCONNECTION TEE* USE CONNECTOR DESIGN TABLE (Table 4A or 5A) RISE USE TOTAL HEIGHT FOR THIRDFLOOR APPLIANCE AND COMBINED INPUT OF THREE APPLIANCES; IF TOP-FLOOR APPLIANCE IS NOT CONNECTED, MEASURE TOTAL HEIGHT TO
Type B Double-Wall Gas Vents Table 7 Appliance Input Total BTUH To Common Vent Available Connector Rise Min. Total Vent Height Connector Size 1 2 3 4 90,000 180,000 270,000 90,000 10' 1' 1' 6' 10' 10' 16' 6' 5" 6" 6" 5" Common Vent Size self-venting connector 7" 7" self-venting connector Special Considerations and Additional Precautions A.
Factory-Built All-Fuel Chimney Systems Sizing Guide 23 2
Model TLC All-Fuel Chimney System Description The Hart & Cooley® MODEL TLC all-fuel chimney system consists of straight sections and other necessary fittings, which are constructed of stainless steel outer jacket and stainless steel inner liner spaced one inch smaller to provide an enclosure for solid pack insulation.
Oil-Fired Appliance Chimney Sizing (Tables based on steady state efficiency. Content from NFPA 31, 2006 Edition.) Chimney Sizing for 88% Steady State Appliances (10-14% CO2, 300°F gross) System Lateral, Ft. GPH for GPH for GPH for Height, Ft. w/ (2) 90° turns 6" dia 5" dia 4" dia 4 0.5-1.0 0.4-0.65 0.25 10 10 0.4-0.75 NR NR Chimney Sizing for 82% Steady State Appliances (10-14% CO2, System Lateral, Ft. GPH for GPH for Height, Ft. w/ (2) 90° turns 6" dia 5" dia 4 0.4-1.5 0.25-1.0 10 10 0.4-1.5 0.25-0.
Model TLC All-Fuel Chimney System Table 9 Input BTUH X 1000 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 Chimney Sizing for Lower Efficiency Oil-Fired Appliances (600°F temperature rise at 9% CO2) Chimney Diameter 6 7 8 6 7 8 10 6 7 8 10 7 8 10 12 8 10 12 14 10 12 14 10 12 14 10 12 14 12 14 12 14 12 14 12 14 14 14 14 90° Turns Equiv. Ft.* 1 1 1 2 1½ 1 1 4½ 3 1½ 1 4½ 3 1½ 1 4 2 1 1 2½ 1½ 1 3½ 1½ 1 4½ 2½ 1 3 2 3½ 2 4 2 4½ 2½ 3 3½ 4 0.
Chimney Sizing for Open-Face Fireplaces CHIMNEY HEIGHT HEIGHT WIDTH Figure 18 Example—Note Purple Line GIVEN: • Fireplace opening size 30 inches x 24 inches. • Desired height from top of opening to top of chimney 15 feet. www.hartandcooley.com SOLUTION: At right-hand section of chart, find intersection of 30-inch and 24-inch lines. Proceed horizontally to left until 15-foot height line is intersected. This intersection occurs within the limits of a 10-inch chimney size.
Notes 28 Sizing Guide www.hartandcooley.
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