Procom EL250RYLB-O, EN250RYLB-O Ventilation Air From Outdoors, Air From Outdoors below

3. Add the	Btu/Hr of all fuel burning appliances in the space.
Vent-free heater			Btu/Hr	Example:
Gas water heater*			Btu/Hr
				Gas water heater			30,000	Btu/Hr
Gas furnace			Btu/Hr
Vented gas heater			Btu/Hr	Vent-free heater		+	26,000	Btu/Hr
Gas heater logs			Btu/Hr	Total	=		56,000	Btu/Hr
Other gas appliances* +			Btu/Hr
Total	=		Btu/Hr
*Do not include direct-vent		gas appliances. Direct-vent		draws combustion	air		from the	outdoors and
vents to the outdoors.

4.Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used. Btu/Hr (maximum the space can support)

Btu/Hr (actual amount of Btu/Hr used)

Example : 51,200 Btu/Hr(maximum the space can support) 56,000 Btu/Hr(actual amount of Btu/Hr used)

The space in the above example is a confined space because the actual Btu/Hr used is more than the maximum Btu/Hr the space can support.

You must provide additional fresh		air. Your options are as follows:
A. Rework worksheet, adding the		space of	an	adjoining room. If the extra space provides an unconfined
space, remove door to adjoining		room or	add	ventilation grills		between rooms. See Ventilation Air From
Inside Building (below).
B. Vent room directly to	the outdoors. See Ventilation				Air From Outdoors (below) .
C. Install a lower Btu/Hr	heater, if	lower Btu/Hr		size	makes room	unconfined.

If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation.

WARNING: If the area in which the heater may be operated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code,

ANS Z223.1, Section 5.3 or applicable local codes.

Ventilation Air From lnside Building

This fresh air would come from an adjoining uncon- fined space. When ventilating to an adjoining unconfined space, you must provide two perma- nent openings: one within 12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces (see options 1 and 2, Figure 2). You can also remove door into adjoining room (see option 3, Figure 2). Follow the National Fuel Gas Code. NFPA 24/ANS Z223.1. Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.

12"

		Ventilation Grills
Ventilation	Or	into Adjoining Room,
		Option 2
Grills	Remove
into	Door into
Adjoining	Adjoining
Room,	Room ,
Option 1	Option 3
		12"

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor. Connect these items directly to the outdoors or spaces open to the outdoors. These spaces include attics and crawl spaces. Follow the National Fuel Gas Code, NFPA 54/ANS Z223.1, Section 5.3. Air for Combustion and Ventilation for required size of ventilation grills or ducts.

IMPORTANT:Do not provide openings for inlet or outlet air into attic if attic has a thermostat- controlled power vent. Heated air entering the attic will activate the power vent.

Figure 2 -Ventilation Air from Inside Building

	Ventilated
Outlet Air	Attic
Outlet	To Attic
Air
	To
	Crawl
	Space

Intlet
Air		Ventilated
	Inlet Air
		Crawl Space

Figure 3 -Ventilation Air from Outdoors

WARNING: Rework worksheet, adding the space of the adjoining unconfined space. The combined spaces must have enough fresh air to supply all appliances in both spaces.

6