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Manafacture: Country Flame File size: 1.41 mb File name: Language of manual:

. This air exchange system is balanced to the number of occupants and the fuel burning appliances located in the home. If additional combustion devices are added to a home, a certified professional should rebalance the air exchanger. Rebalancing the system adjusts for the fresh air usage of any new combustion appliance. Rebalancing the air exchanger ensures proper amounts of fresh air for the home occupants and other appliances. If your home contains an air exchange system, contact a local certified professional to have a fresh air analysis done while the Country Flame appliance is being installed. A homeowner needs to understand the terms “restricted” and “unrestricted” air space. Even though properly installed direct vent chimney systems eliminate combustion air requirements there is still the requirement for ventilation air. If a home is not air tight, depending on room configuration and other fresh air barriers, a gas appliance can still be installed in too small a room and “starved or restricted” from receiving the proper amount of necessary air. Again, this is not true of Direct Vent appliances whose chimneys provide for combustion air; however, direct vent appliance chimney systems do not provide for ventilation air requirements. Determining the amount of fresh air available to a gas appliance is a relatively easy mathematical exercise. Get out the old calculator and follow the examples provided. First, here are the “official” definition of terms: a) Space: a room where a gas appliance is to be placed. The total space required to ensure proper fresh air to a gas appliance can include additional space or room(s) if there is no restriction to airflow between the space(s) or room(s). “Unrestricted” space means (i) no closable doors can exist between rooms or (ii) there must be proper sized grills (non-closing) placed between adjoining spaces or rooms. If closable doors exist or no grills exist between adjoining rooms, then the adjoining space next to where the gas appliance is to be located cannot be included in the calculation to determine if adequate fresh air exists for proper operation of the gas appliance. b) Unrestricted space: is defined as an area that provides at least 50 cubic feet of air volume for each 1,000 Btu per hour of input heat rating of a gas appliance. The 50 cubic feet of fresh air volume is made up of primary (combustion) and secondary (heated) air requirements. Vented gas appliances use 10 cubic feet of the available volume of air for primary (combustion) air. Again, Direct Vent gas appliances fulfill combustion air requirements by providing this air through the chimney system. The additional 40 cubic feet of fresh air is heated and moved throughout the home as secondary (ventilation) air. Thus, for the Bayvue DV to operate properly the appliance requires 1,840 cubic feet of unrestricted air space. This requirement was determined by taking the 46,000 Btu/H and dividing it by 1,000 Btu/H which equals 46. Now multiply 46 times the 40 cubic feet (ventilation air only) requirement which equals 1,840 cubic feet of room space. If a Country Flame vented appliance was being installed, the minimum room size would increase to 2,300 square feet as combustion air would have to be supplied by the room. Always use the highest Btu/H rating of an appliance to determine the maximum fresh air requirement before an appliance is placed in a room. NOTE: Cubic feet equals the length times width times height of the room where the gas appliance is to be installed. Adjoining spaces air volume can be included only if the spaces are connected by doorless passageways or non closing grills that connects to the room where the gas appliance is installed. c) Restricted space: is defined as an area that has less than 50 cubic feet of air volume for each 1,000 Btu per hour of input heat rating of the gas appliances installed in that area. WARNING: NEVER install a gas appliance in a restricted space unless adequate airflow is provided for proper combustion and ventilation (primary and secondary air) to that restricted space. EXAMPLE 1: A basement room is going to have a gas heater installed. The room is 8’4” by 18’7” by 23’0” for a total air volume of 3,561.8 cubic feet. Divide the rooms cubic feet of air space by 50 cubic feet (40 cubic feet if a direct vent system was being installed) which gives 71.24. Multiply 71.24 times 1,000 Btu/H. This means that as long as the appliance being installed in this particular room has less than a 71,236 Btu/H input rating, there is enough air volume to support proper combustion and ventilation air. This specific example would be classified as an unrestricted space. EXAMPLE 2: A room will have a direct vent fireplace installed that has an input rating of 26,200 Btu/H. An adjoining room connected by a doorless passageway contains a 60,000 Btu/H rated furnace. The room where the direct vent appliance will be installed is 10’ by 15’ by 8’ with an air volume of 1,200 cubic feet. Th...

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