Exhaust blowers that are in a fuel storage room should be installed so as not to create negative pressure in the room where the solid fuel appliance is located. A fresh air supply may be necessary to prevent furnace from rejecting products of combustion into the house. The indications used to determine if an additional fresh air supply is necessary are not appropriate for all the situations. When in doubt, it is recommended to install a fresh air supply. A fresh air supply may be needed if: - Solid fuel units present anomalies, such as irregular draft, smoke return, bad combustion, and/or reversed draft (whether there is combustion or not); - Existing units such as a stove, a furnace or fireplace release odours, heat badly, cause smoke returns, or reversed draft (whether there is combustion or not ); - The opening of a window, even slightly, in calm weather (windless), eliminates every problem mentioned above ; - The house is equipped with a tight vapour/air barrier and adjusted windows, and/or is equipped with an interior air mechanical evacuation device ; - There is excessive condensation on the windows in winter; and - The house is equipped with a ventilation system. If, according to these symptoms or other similar ones, there is insufficient combustion air, it is necessary to ensure an additional combustion air supply (see Section 6: Air Supply in conventional houses ). 9.8 Ash drawer Your furnace is equipped with an ash drawer to collect ashes produced by the combustion of wood. The ash drawer is provided with one (1) wing nut to hold the door in a close position. Operating the furnace with the ash drawer open may cause overfiring and damage the furnace. The drawer must be emptied weekly. 9.9 Prolonged power outage To reduce the risk of overheating during a prolonged power outage (more than 10 minutes), the combustion air controls will be closed automatically. If your furnace is equipped with the optional filter, remove the air filter to improve the circulation of air around the combustion chamber of the furnace. Do not load the furnace more than 50 percent of its capacity to prevent the risk of overheating,
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