Wood Stove Backdrafting
Inadequate combustion air, poor draft and green wood are common causes of excessive creosote. A simple test to check for sufficient combustion air is to open a basement window. Tight houses require permanent provision for combustion and ventilation air. Optimum draft is achieved using a well insulated, properly sized chimney. Draft is usually weakest in milder weather. The recommended moisture content is no more than 20% – wood should be seasoned for several months. Reduced weight and radial cracking are evidence of dry wood.
Wood Add-On & Gas Fired Furnace
We have received numerous inquiries regarding the utilization of our Solid Fuel Add-On furnaces with gas-fired equipment. Newmac Models WAO & GAO are not safety certified for use with gas fired appliances. Neither model was evaluated and tested for this application. Therefore, Newmac cannot recommend these units as add-ons to gas fired appliances.
Solid Fuel Pipe
The flue pipe must be constructed of steel with a melting point of not less than 2000°F. Galvanized steel must not be used for the flue pipe.
Barometric Draft Regulators Used with Wood/Oil Combinations and Solid Fuel Furnaces
A barometric draft regulator is required on all Newmac models – it is shipped with the furnace. The type of draft regulator used does not form part of the flue pipe (chimney connector). It is mounted on the flue pipe and is cooled by the dilution air passing over its surface (chimney connector). Therefore, it is not subjected to temperatures as high as the flue pipe.
Panning Joists
There have been numerous inquiries about using the joist cavity for the cold air return with solid fuel furnaces. The direction of air flow through solid fuel burning furnaces can reverse during power failures. Heating supply and return air ducts on combination and solid-fuel-burning, warm-air furnaces shall be made of noncombustible material unless the appliance is otherwise certified. The ducts must be made from sheet metal and suspended the required distance from combustible material.
Solid Fuel Furnace Clearances
Unless the appliance is certified for lesser clearances, return (cold) air ducts, including main ducts and branch ducts, on solid-fuel-burning warm-air furnaces shall be installed to provide at least 75 mm (3 in) clearance to combustible construction for the first 1.8 m (6 ft.) of duct run from the furnace plenum. This requirement is not intended to apply to return air ducts serving an oil, gas, or electric furnace to which an add-on furnace is connected.
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