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

FRESH AIR FOR	Example 2: Locating Heater in Confined (Closed) Area
COMBUSTION
		NOTICE
AND
		A confined area has an air volume of less than 50 cubic
VENTILATION		feet for each 1000 BTU/Hr input rating of all appliances
		in the area (cubic feet equals length x width x height of
Continued		area). Include adjoining rooms only if there are no doors
		between the rooms.
	If you install this heater in a confined area, you must provide additional fresh air.
	Ventilating Confined Area
	This fresh air would come from an adjoining open area or outdoors.
		WARNING
		The adjoining open area must have enough fresh,
		outside air ventilation to supply any appliance in that
		area plus the confined area. Follow instructions under
		Example 1: Locating Heater in Unconfined (Open) Area,
		page 17 to make sure fresh air ventilation is adequate.
	When ventilating to an adjoining open area, you must provide two permanent
	openings: one within 12" of the ceiling and one within 12" of the floor on the wall
	connecting the two areas. Follow the National Fuel Gas Code NFPA 54/ANSI
	Z223.1. It lists fresh-air requirements for fuel-burning appliances.

Ventilation

Grills into

Closet for

Hot Water

Heater

12"

Ventilation Grills

Connecting Two Rooms to Meet Unconfined Space

12"

Recommended

Fresh Air Duct into Crawl Space in Furnace Area or in

Closet with Water Heater

Figure 15 - Ventilation Air from Inside Building

After providing ventilation between rooms, check for draft hood spillage (see Draft Hood Spillage Test, page 17). If draft hood spillage still occurs, provide more ventilation between rooms or provide permanent ventilation from outdoors. See Providing Permanent Fresh-Air Ventilation, page 18.

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