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Exhaust fans, fireplaces, clothes dryers, and fuel-burning appliances draw air from the house to operate. This heater is a fuel-burning appliance. It uses air from inside the house for combustion. It also uses this air as a draft for venting. This draft air helps move combustion gases through the vent pipe to the outdoors. If your house is too airtight, there is not enough fresh air for these items to use. Fresh air may draw back into the house through venting flues and chimneys. This will keep fuel- burning appliances from venting properly. This may cause them to release poisonous carbon monoxide gas into your home. It is very important to provide enough fresh air to run all fuel-burning appliances. DANGER Carbon monoxide poisoning may lead to death! Carbon monoxide is a colorless, odorless gas. Early signs of carbon monoxide poisoning resemble the flu, with headaches, dizziness, and/or nausea. If you have these signs, the heater may not be operating or venting properly. Get fresh air at once! Have heater or heater venting system serviced. Some people are more affected by carbon monoxide than others. These include pregnant women, persons with heart and lung disease and anemia, those under the influence of alcohol, and those at high altitudes. Continued 17 AIR FOR COMBUSTION AND VENTILATION Continued In the absence of local codes, use the following excerpts from the National Fuel Gas Code NFPA 54/ANSI Z223.1, Air for Combustion and Ventilation. DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION Example 1: Locating Heater in Unconfined (Open) Area NOTICE An unconfined area has a minimum air volume of 50 cubic feet for each 1000 BTU/Hr input rating of all appliances in the area (cubic feet equals length x width x height of area). Include adjoining rooms only if there are no doors between the rooms or if you add ventilation grills between the rooms (see Ventilating Confined Area,page 20). In an open area, the air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. Draft Hood Spillage Test Follow the steps below to see if enough fresh air is available. 1. Close all windows and doors. 2. If you have a fireplace, start a fire. Build fire until flames are burning strongly. 3. Turn on all exhaust fans. These include exhaust fans for kitchen, bathroom, water heaters (gas or electric), etc. 4. Turn on all vented gas appliances. These include any room heaters, water heaters, clothes dryer, etc. 5. Wait ten minutes for drafts to regulate. 6. Check for draft-hood spillage at each vented gas appliance. Do this by holding a lit match two inches from the draft opening (see Figure 14). If match flame pulls toward the draft hood, there is no spillage. If match flame blows away from the draft hood, there is spillage. This is a hazardous condition. See Draft Hood Spillage, page 19. Vent Pipe Draft Hood Typical Water Heater Match Heater Match Draft Hood Opening Vent Pipe Figure 14 - Checking for Draft Spillage No Draft Hood Spillage: This shows there is enough fresh air in area for appliances. Turn off all exhaust fans and appliances if desired. 18 AIR FOR COMBUSTION AND VENTILATION Continued Draft Hood Spillage: This is a hazardous situation. Draft hood spillage releases poisonous carbon monoxide gas into your home. DANGER Carbon monoxide poisoning may lead to death! If draft hood spillage occurs, check for blocked flue connectors, vent pipes, and chimneys. If you find blockage, remove. Test again for spillage. If spillage still occurs or there was no blockage, you need more fresh, outside air in the house. You must provide additional fresh-air ventilation. Follow the steps below at once. A. Open a window near the appliance(s) at least two inches. Test again for spillage. If spillage does not stop, open window more and retest. If spillage stops, keep window open while running appliance(s). Supply fresh, outside air by a permanent method as soon as possible. If spillage still occurs, leave window open and go to next step. B. If you have a fireplace, open a window or door near it at least two inches. Test again for spillage. If spillage does not stop, open window or door more and retest. If spillage stops, keep window or door open while using fireplace. Supply fresh, outside air by a permanent method as soon as possible. If spillage still occurs, leave window or door open and go to next step. C. If you have kitchen and bathroom exhaust fans, turn them off. Test again for spillage. If spillage stops, do not use exhaust fans. Turn off circuit breakers for fans if possible. Permanently supply fresh, outside air as soon as possible. Providing Permanent Fresh-Air Ventilation If draft hood spillage occurs, you must permanently supply fresh, outside air to the inside of your house. Provide extra fresh air by using ventilation grills or ducts. Connect these items directly to the outdoors or spaces open to the outdoors. These spaces include attics and crawl spaces. If you install this heater in an...

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