Desa GVB35N, GVB50N installation manual Fresh Air For, Combustion, Ventilation, Danger, Continued

FRESH AIR FOR		Draft Hood Spillage: This is a hazardous situation. Draft hood spillage re-
	COMBUSTION	leases poisonous carbon monoxide gas into your home.
						DANGER
	AND
			Carbon monoxide poisoning may lead to death!
	VENTILATION
	Continued	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 fire-
			place. 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 area with
		other gas appliances, you must total the BTU/Hr input rating of all appliances.
		Follow the National Fuel Gas Code NFPA 54/ANSI Z223.1. It lists fresh-air
		requirements for fuel-burning appliances.
					IMPORTANT
			Do not provide openings for inlet or outlet air into attic
			if attic has a thermostat controlled power vent.
				Chimney
				or Gas
				Vent	Outlet		Ventilated
							Attic
					Air
			Outlet
			Air
										To Attic
										To
										Crawl
			Inlet							Space
			Air
					Inlet Air				Ventilated
								Crawl Space
				Figure 14 - Ventilation Air from Outdoors
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