# SIZING OF VENTING SYSTEMS SERVING APPLIANCES EQUIPPED WITH DRAFT HOODS, CATEGORY I APPLIANCES, AND APPLIANCES LISTED FOR USE WITH TYPE B VENTS

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1 (IFGS) SIZING OF VENTING SYSTEMS SERVING APPLIANCES EQUIPPED WITH DRAFT HOODS, CATEGORY I APPLIANCES, AND APPLIANCES LISTED FOR USE WITH TYPE B VENTS (This appendix is informative and is not part of the code. This appendix is an excerpt from the Fuel Gas Code of New York State, coordinated with the section numbering of the Residential Code of New York State.) EXAMPLES USING SINGLE APPLIANCE VENTING TABLES Example 1: Single Draft Hood-Equipped Appliance An installer has a 120,000 Btu per hour input appliance with a 5-inch (127 mm) diameter draft hood outlet that needs to be vented into a 10-foot high Type B vent system. What size vent should be used assuming (a) a 5-foot (152 cm) lateral single-wall metal vent connector is used with two 90-degree elbows, or (b) a 5-foot (152 cm) lateral single-wall metal vent connector is used with three 90-degree elbows in the vent system? Table G2428.2(2) should be used to solve this problem, because single-wall metal vent connectors are being used with a Type B vent. (a) Read down the first column in Table 504.2(2) until the row associated with a 10-foot height and 5-foot (152 cm) lateral is found. Read across this row until a vent capacity greater than 120,000 Btu per hour is located in the shaded columns labeled NAT Max for draft hood-equipped appliances. In this case, a 5-inch (127 mm) diameter vent has a capacity of 122,000 Btu per hour and may be used for this application. (b) If three 90-degree elbows are used in the vent system, then the maximum vent capacity listed in the tables must be reduced by 10 percent (see Section G for Single Appliance Vents). This implies that the 5-inch diameter vent has an adjusted capacity of only 110,000 Btu per hour. In this case, the vent system must be increased to 6 inches in diameter. See calculations below. 122,000 (.90) = 110,000 for 5-inch Vent From Table G , Select 6-inch Vent 186,000 (.90) = 167,000; This is greater than the required 120,000. Therefore, use a 6-inch vent and connector where three elbows are used. Example 2: Single Fan-Assisted Appliance An installer has an 80,000 Btu per hour input fan-assisted appliance that must be installed using 10 feet of lateral connector attached to a 30-foot high Type B vent. Two 90-degree elbows are needed for the installation. Can a single-wall metal vent connector be used for this application? For SI: 1 foot = mm. Table G2428.2(1) is used when sizing a Type B double-wall gas vent connected directly to the appliance. NOTE: The appliance may either be Category I draft hood-equipped or fan-assisted types. FIGURE B-1 TYPE B DOUBLE-WALL VENT SYSTEM SERVING A SINGLE APPLIANCE WITH A TYPE B DOUBLE-WALL VENT Table G2428.2(2) is used when sizing a single-wall metal vent connector attached to a Type B double-wall gas vent. NOTE: The appliance may either be Category I draft hood-equipped or fan-assisted types. FIGURE B-2 TYPE B DOUBLE-WALL VENT SYSTEM SERVING A SINGLE APPLIANCE WITH A SINGLE-WALL METAL VENT CONNECTOR RESIDENTIAL CODE OF NEW YORK STATE 521

2 Table 504.2(3) of the Fuel Gas Code of New York State is used when sizing Type B double-wall gas vent connector attached to a tile-lined masonry chimney. NOTE: A is the equivalent cross-sectional area of the tile liner. The appliance may either be Category I draft hood-equipped or fanassisted type. Asbestos cement Type B or single-wall metal vent serving a single draft hoodequipped appliance. [See Table (5) of the Fuel Gas Code of New York State.] FIGURE B-5 ASBESTOS CEMENT TYPE B OR SINGLE-WALL METAL VENT SYSTEM SERVING A SINGLE DRAFT HOOD-EQUIPPED APPLIANCE Table 504.2(4) of the Fuel Gas Code of New York State is used when sizing a single-wall vent connector attached to a tile-lined masonry chimney. NOTE: A is the equivalent cross-sectional area of the tile liner. The appliance may either be Category I draft hood-equipped or fanassisted type. FIGURE B-4 VENT SYSTEM SERVING A SINGLE APPLIANCE USING A MASONRY CHIMNEY AND A SINGLE-WALL METAL VENT CONNECTOR Table G2428.3(1) is used when sizing Type B double-wall vent connectors attached to a Type B double-wall common vent. NOTE: Each appliance may be either Category I draft hood-equipped or fan-assisted type. FIGURE B-6 VENT SYSTEM SERVING TWO OR MORE APPLIANCES WITH TYPE B DOUBLE-WALL VENT AND TYPE B DOUBLE-WALL VENT CONNECTOR 522 RESIDENTIAL CODE OF NEW YORK STATE

3 Table (2) is used when sizing single-wall vent connectors attached to a Type B double-wall common vent. NOTE: Each appliance may either be Category I draft hood-equipped or fan-assisted type. FIGURE B-7 VENT SYSTEM SERVING TWO OR MORE APPLIANCES WITH TYPE B DOUBLE-WALL VENT AND SINGLE-WALL METAL VENT CONNECTORS Table G2428.3(4) is used when sizing single-wall vent connectors attached to a tile-lined masonry chimney. NOTE: A is the equivalent cross-sectional area of the tile liner. The appliance may either be Category I draft hood-equipped or fanassisted type. FIGURE B-9 MASONRY CHIMNEY SERVING TWO OR MORE APPLIANCES WITH SINGLE-WALL METAL VENT CONNECTORS Table G2428.3(3) is used when sizing Type B double-wall vent connectors attached to a tile-lined masonry chimney. NOTE: A is the equivalent cross-sectional area of the tile liner. The appliance may either be Category I draft hood-equipped or fan-assisted type. FIGURE B-8 MASONRY CHIMNEY SERVING TWO OR MORE APPLIANCES WITH TYPE B DOUBLE-WALL VENT CONNECTOR Asbestos cement Type B or single-wall metal pipe vent serving two or more draft hood-equipped appliances. [See Table 504.3(5) of the Fuel Gas Code of New York State.] FIGURE B-10 ASBESTOS CEMENT TYPE B OR SINGLE-WALL METAL VENT SYSTEM SERVING TWO OR MORE DRAFT HOOD-EQUIPPED APPLIANCES RESIDENTIAL CODE OF NEW YORK STATE 523

4 EXAMPLE: Manifolded Common Vent Connector L M shall be no greater than 18 times the common vent connector manifold inside diameter: i.e., a 4 in. (100 mm) inside diameter common vent connector manifold shall not exceed 72 in. (1829 mm) in length. (See Section G ). NOTE: This is an illustration of a typical manifolded vent connector. Different appliance, vent connector or common vent types are possible. Consult Section G For SI: 1 inch = 25.4 mm. Vent connector size depends on: Input Rise Available total height H Table G2428.3(1) connectors Common vent size depends on: Combined inputs Available total height H Table G2428.3(1), Common Vent FIGURE B-13 MULTISTORY GAS VENT DESIGN PROCEDURE FOR EACH SEGMENT OF SYSTEM FIGURE B-11 USE OF MANIFOLD COMMON VENT CONNECTOR Example: Offset Common Vent NOTE: This is an illustration of a typical offset vent. Different appliance, vent connector or vent types are possible. Consult Sections G and G FIGURE B-12 USE OF OFFSET COMMON VENT NOTE: Principles of design of multistory vents using vent connector and common vent design tables. (See Sections G through G ) FIGURE B-14 MULTISTORY VENT SYSTEMS 524 RESIDENTIAL CODE OF NEW YORK STATE

5 For SI: 1 foot = mm, 1 Btu/hr = W. For SI: 1 foot = mm, 1 Btu/hr = W. FIGURE B-15 (EXAMPLE 1) SINGLE DRAFT HOOD-EQUIPPED APPLIANCE Table G2428.2(2) refers to the use of single-wall metal vent connectors with Type B vent. In the first column find the row associated with a 30-foot height and a 10-foot lateral. Read across this row, looking at the FAN Min and FAN Max columns, to find that a 3-inch diameter single-wall metal vent connector is not recommended. Moving to the next larger size single wall connector (4 inches) we find that a 4-inch diameter single-wall metal connector has a recommended minimum vent capacity of 91,000 Btu per hour and a recommended maximum vent capacity of 144,000 Btu per hour. The 80,000 Btu per hour fan-assisted appliance is outside this range, so the conclusion is that a single-wall metal vent connector cannot be used to vent this appliance using 10 feet of lateral for the connector. However, if the 80,000 Btu per hour input appliance could be moved to within 5 feet of the vertical vent, then a 4-inch single-wall metal connector could be used to vent the appliance. Table G2428.2(2) shows the acceptable range of vent capacities for a 4-inch vent with 5 feet of lateral to be between 72,000 Btu per hour and 157,000 Btu per hour. If the appliance cannot be moved closer to the vertical vent, then Type B vent could be used as the connector material. In this case, Table G2428.2(1) shows that for a 30-foot high vent with 10 feet of lateral, the acceptable range of vent capacities for a 4-inch diameter vent attached to a fan-assisted appliance is between 37,000 Btu per hour and 150,000 Btu per hour. FIGURE B-16 (EXAMPLE 2) SINGLE FAN-ASSISTED APPLIANCE Example 3: Interpolating Between Table Values An installer has an 80,000 Btu per hour input appliance with a 4-inch diameter draft hood outlet that needs to be vented into a 12-foot high Type B vent. The vent connector has a 5-foot lateral length and is also Type B. Can this appliance be vented using a 4-inch diameter vent? Table G2428.2(1) is used in the case of an all Type B vent system. However, since there is no entry in Table G2428.2(1) for a height of 12 feet, interpolation must be used. Read down the 4-inch diameter NAT Max column to the row associated with 10-foot height and 5-foot lateral to find the capacity value of 77,000 Btu per hour. Read further down to the 15-foot height, 5-foot lateral row to find the capacity value of 87,000 Btu per hour. The difference between the 15-foot height capacity value and the 10-foot height capacity value is 10,000 Btu per hour. The capacity for a vent system with a 12-foot height is equal to the capacity for a 10-foot height plus 2 / 5 of the difference between the 10-foot and 15-foot height values, or 77, / 5 (10,000) = 81,000 Btu per hour. Therefore, a 4-inch diameter vent may be used in the installation. EXAMPLES USING COMMON VENTING TABLES Example 4: Common Venting Two Draft Hood-Equipped Appliances A 35,000 Btu per hour water heater is to be common vented with a 150,000 Btu per hour furnace using a common vent RESIDENTIAL CODE OF NEW YORK STATE 525

7 Therefore, the 5-inch common vent should be used in this example. Summary. In this example, the installer may use a 4-inch diameter, single-wall metal vent connector for the water heater and a 4-inch diameter, single-wall metal vent connector for the furnace. The common vent should be a 5-inch diameter Type B vent. For SI: 1 foot mm, 1 Btu/hr = W. FIGURE B-18 (EXAMPLE 4) COMMON VENTING A DRAFT HOOD WITH A FAN-ASSISTED FURNACE INTO A TYPE B DOUBLE-WALL COMMON VENT Example 5b: Common Venting into a Masonry Chimney In this case, the water heater and fan-assisted furnace of Example 5a are to be common vented into a clay tile-lined masonry chimney with a 30-foot height. The chimney is not exposed to the outdoors below the roof line. The internal dimensions of the clay tile liner are nominally 8 inches by 12 inches. Assuming the same vent connector heights, laterals, and materials found in Example 5a, what are the recommended vent connector diameters, and is this an acceptable installation? Table G2428.3(4) is used to size common venting installations involving single-wall connectors into masonry chimneys. Water Heater Vent Connector Diameter. Using Table G2428.3(4), Vent Connector Capacity, read down the Total Vent Height (H) column to 30 feet, and read across the 2-foot Connector Rise (R) row to the first Btu per hour rating in the NAT Max column that is equal to or greater than the water heater input rating. The table shows that a 3-inch vent connector has a maximum input of only 31,000 Btu per hour while a 4-inch vent connector has a maximum input of 57,000 Btu per hour. A 4-inch vent connector must therefore be used. Furnace Vent Connector Diameter. Using the Vent Connector Capacity portion of Table G2428.3(4), read down the Total Vent Height (H) column to 30 feet and across the 3-foot Connector Rise (R) row. Since the furnace has a fan-assisted combustion system, find the first FAN Max column with a Btu per hour rating greater than the furnace input rating. The 4-inch vent connector has a maximum input rating of 127,000 Btu per hour and a minimum input rating of 95,000 Btu per hour. The 100,000 Btu per hour furnace in this example falls within this range, so a 4-inch connector is adequate. Masonry Chimney. From Table B-1, the Equivalent Area for a Nominal Liner size of 8 inches (12 inches is 63.6 square inches). Using Table G2428.3(4), Common Vent Capacity, read down the FAN + NAT column under the Minimum Internal Area of Chimney value of 63 to the row for 30-foot height to find a capacity value of 739,000 Btu per hour. The combined input rating of the furnace and water heater, 135,000 Btu per hour, is less than the table value, so this is an acceptable installation. Section G of the Fuel Gas Code of New York State requires the common vent area to be no greater than seven times the smallest listed appliance categorized vent area, flue collar area, or draft hood outlet area. Both appliances in this installation have 4-inch diameter outlets. From Table B-1, the Equivalent Area for an Inside Diameter of 4 inches is 12.2 square inches. Seven times 12.2 equals 85.4, which is greater than 63.6, so this configuration is acceptable. Example 5c: Common Venting into an Exterior Masonry Chimney In this case, the water heater and fan-assisted furnace of Examples 5a and 5b are to be common vented into an exterior masonry chimney. The chimney height, clay tile liner dimensions, and vent connector heights and laterals are the same as in Example 5b. This system is being installed in Charlotte, North Carolina. Does this exterior masonry chimney need to be relined? If so, what corrugated metallic liner size is recommended? What vent connector diameters are recommended? According to Section of the IFGC, Type B vent connectors are required to be used with exterior masonry chimneys. Use Table 504.3(8) of the IFGC to size FAN+NAT common venting installations involving Type-B double wall connectors into exterior masonry chimneys. The local 99-percent winter design temperature needed to use Table 504.3(8) can be found in the ASHRAE Handbook Fundamentals. For Charlotte, North Carolina, this design temperature is 19 F (-7.2 C). Chimney Liner Requirement. As in Example 5b, use the 63 square inches Internal Area columns for this size clay tile liner. Read down the 63 square inches column of Table 504.3(8a) of the IFGC to the 30-feet height row to find that the combined Appliance Maximum Input is 747,000 Btu per hour. The com- RESIDENTIAL CODE OF NEW YORK STATE 527

8 bined input rating of the appliances in this installation, 135,000 Btu per hour, is less than the maximum value, so this criterion is satisfied. Table 504.3(8b), at a 19 F (-7.2 C) Design Temperature, and at the same Vent Height and Internal Area used above, shows that the minimum allowable input rating of a space-heating appliance is 470,000 Btu per hour. The furnace input rating of 100,000 Btu per hour is less than this minimum value. So this criterion is not satisfied, and an alternative venting design needs to be used, such as a Type B vent shown in Example 5a or a listed chimney liner system shown in the remainder of the example. According to Section G , Table G2428.3(1) or Table G2428.3(2) are used for sizing corrugated metallic liners in masonry chimneys, with the maximum common vent capacities reduced by 20 percent. This example will be continued assuming Type B vent connectors. Water Heater Vent Connector Diameter. Using Table G2428.3(1), Vent Connector Capacity, read down the Total Vent Height (H) column to 30 feet, and read across the 2-feet Connector Rise (R) row to the first Btu per hour rating in the NAT Max column that is equal to or greater than the water heater input rating. The table shows that a 3-inch vent connector has a maximum capacity of 39,000 Btu per hour. Although this rating is greater than the water heater input rating, a 3-inch vent connector is prohibited by Section G A 4-inch vent connector has a maximum input rating of 70,000 Btu/h and is equal to the draft hood outlet diameter. A 4-inch vent connection is selected. Furnace Vent Connector Diameter. Using Table G2428.3(1), Vent Connector Capacity, read down the Total Vent height (H) column to 30 feet, and read across the 3-feet Connector Rise (R) row to the first Btu per hour rating in the FAN Max column that is equal to or greater than the furnace input rating. The 100,000 Btu per hour furnace in this example falls within this range, so a 4-inch connector is adequate. Chimney Liner Diameter. The total input to the common vent is 135,000 Btu per hour. Using the Common Vent Capacity Portion of Table G2428.3(1), read down the Total Vent Height (H) column to 30 feet and across this row to find the smallest vent diameter in the FAN+NAT column that has a Btu per hour rating greater than 135,000 Btu per hour. The 4-inch common vent has a capacity of 138,000 Btu per hour. Reducing the maximum capacity by 20 percent ( ) results in a maximum capacity for a 4-inch corrugated liner of 110,000 Btu per hour, less than the total input of 135,000 Btu per hour. So a larger liner is needed. The 5-inch common vent capacity listed in Table G2428.3(1) is 210,000 Btu per hour, and after reducing by 20 percent is 168,000 Btu per hour. Therefore, a 5-inch corrugated metal liner should be used in this example. Single Wall Connectors. Once it has been established that relining the chimney is necessary, Type B double wall vent connectors are not specifically required. This example could be redone using Table G2428.3(2) for single wall vent connectors. For this case, the vent connector and liner diameters would be the same as found above with Type B double wall connectors. NOMINAL LINER SIZE (inches) TABLE B-1 MASONRY CHIMNEY LINER DIMENSIONS WITH CIRCULAR EQUIVALENTS INSIDE DIMENSIONS OF LINER (inches) INSIDE DIAMETER OR EQUIVALENT DIAMETER (inches) EQUIVALENT AREA (square inches) / / / / / / / / / / / / / / / / / / / / / / / / / / / / For SI: 1 inch = 25.4 mm, 1 square inch = m 2. NOTE: Where liner sizes differ dimensionally from those shown in Table B-1, equivalent diameters may be determined from published tables for square and rectangular ducts of equivalent carrying capacity or by other engineering methods. 528 RESIDENTIAL CODE OF NEW YORK STATE

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