Lennox International Inc GWB8-280E-2 Ventilation & Combustion AIR, Canada, Room Cubic Feet Volume

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5 - VENTILATION & COMBUSTION AIR

Provide combustion air and ventilation air in accordance with the section “Air for Combustion and Ventilation,” of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or Sections 8.2, 8.3 or 8.4 of Natural Gas and Propane Installation Code, CAN/CSA B149.1, or applicable provisions of local

building codes.

Provide make-up air where exhaust fans, clothes dryers, and kitchen ventilation equipment interfere with proper operation.

National Fuel Gas Code recognizes several methods of obtaining adequate ventilation and combustion air. Requirements of the authority having jurisdiction may override these methods.

•Engineered Installations. Must be approved by authority having jurisdiction.

•Mechanical Air Supply. Provide minimum of 0.35 cfm per Mbh for all appliances located within space. Additional requirements where exhaust fans installed. Interlock each appliance to mechanical air supply system to prevent main burner operation when mechanical air supply system not operating.

•All Indoor Air. Calculate minimum allowable room volume for all appliances in space. Use a different method if minimum volume not available.

A.Standard Method. Cannot be used if known air infiltration rate is less than 0.40 air changes per hour. See Table 4 for space with boiler only. Use equation for multiple appliances.

Volume ≥ 50 ft3 x Total Input [Mbh]

B.Known Air Infiltration Rate. See Table 4 for space with boiler only. Use equation for multiple appliances. Do not use an air infiltration rate (ACH) greater than 0.60.

Volume ≥ 21 ft3⁄ACH x Total Input [Mbh]

C.Refer to National Fuel Gas Code for opening requirements between connected indoor spaces.

•All Outdoor Air. Provide permanent opening(s) communicating directly or by ducts with outdoors.

A.Two Permanent Opening Method. Provide opening commencing within 12 inches of top and second opening commencing within 12 inches of bottom of enclosure.

Direct communication with outdoors or communicating through vertical ducts. Provide minimum free area of 1 in² per 4 Mbh of total input rating of all appliances in enclosure.

Communicating through horizontal ducts. Provide minimum free area of 1 in² per 2 Mbh of total input rating of all appliances in enclosure.

B.One Permanent Opening Method. Provide opening commencing within 12 inches of top of enclosure. Provide minimum clearance of 1 inch on sides/back and 6 inches on front of boiler (does not supersede clearance to combustible materials).

•Refer to National Fuel Gas Code for additional requirements for louvers, grilles, screens and air ducts.

•Combination Indoor and Outdoor Air. Refer to National Fuel Gas Code for application information.

Canada

National Gas and Propane Installation Code Requires providing air supply in accordance with:

•Section 8.2 and 8.3 when combination of appliances has a total input of up to and including 400 Mbh (120 kW).

•Section 8.4 when combination of appliances has total input exceeding 400 Mbh (120 kW).

•Refer to Natural Gas and Propane Installation Code for specific air supply requirements for enclosure or structure where boiler is installed, including air supply openings and ducts.

Table 4 - Minimum Room Volume, Indoor Air Only*

 

 

 

 

Room Cubic Feet Volume

 

 

Input Mbh

Standard

 

Known Air Infiltration Rate Method (Air Changes Per Hour)

 

Method

0.1

 

0.2

0.3

0.4

0.5

0.6

 

 

262.5

13125

55125

 

27563

18375

13781

11025

9188

299

14950

62790

 

31395

20930

15698

12558

10465

* Table values based on boiler only. Add volume for any additional appliances.

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Contents Product Literature GAS-FIRED HOT Water BoilersInch DimensionsDimensions Boiler Model Number Flue Diameter WidthBoiler Ratings and Capacities Ratings and CapacitiesBoilers for USE AT High Altitude Table of Contents Installation Procedure Minimum Clearances to CombustibleVentilation & Combustion AIR Minimum Room Volume, Indoor Air OnlyRoom Cubic Feet Volume CanadaCheck local Connecting Supply and Return PipingRelief Valve Discharge Line DischargeTemperature Pressure Gauge For USE with Cooling UnitsTypical Hot Water Piping Bypass Piping Circulator on Supply Check Your Chimney Connecting The Vent Damper And Vent ConnectorChimney and Vent Pipe Connection Chimney SizingMinimum Vent Pipe Clearance Removing Existing Boiler From Common Venting SystemVent Damper Installation Vent Damper Manual OperationCheck GAS Supply GAS Supply PipingGas Pipe Sizes Checking GAS PipingElectric Power Supply Electrical WiringVent Damper Wiring Thermostat InstallationWiring Diagrams Integrated High Limit Electronic Ignition ControlWiring Diagrams Integrated High Limit Electronic Ignition Control General Instructions Filling System with WaterDo not use this appliance if any part has Lighting InstructionsLight this burner by hand To Turn OFF GAS to ApplianceOperating Your Boiler Check Thermostat Operation Maintaining Your Boiler Possible Cause What to do Service HintsIf Your System is not Heating or not Giving Enough Heat If Burner is NoisyEquipment and Optional Accessories Rollout Switch Flame Rollout Safety Shutoff Blocked Vent Safety Switch Blocked Vent Safety ShutoffAppendix a Control Module Installation Environment ConsiderationsAdjusting Settings Electrical ConnectionsOperation Operation State CodesBoiler High Limit Temperature Controller TroubleshootingTroubleshooting Error Codes Intermittent Pilot ErrorDefinition StepTroubleshooting Pilot Flame Correct Pilot Flame 3/8 to 1/2 inch in flame. See ,Lennox Industries Inc. Dallas, Texas
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One of the key features of the GWB8 series is its energy-efficient operation. These boilers are designed to achieve an AFUE (Annual Fuel Utilization Efficiency) rating of up to 84%, allowing homeowners to save on energy costs while reducing their environmental footprint. The product utilizes a cast-iron heat exchanger, which promotes optimal heat retention and distribution, ensuring consistent performance throughout the heating season.

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