Procom ML170EPC Specifications download pdf (Page 6)

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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.

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining

unconfined space. When ventilating to an adjoin-

ing unconfined space, you must provide two per-

manent 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 54/ANSI Z223.1. Section 5.3, Air for

Combustion and Ventilation for required

size of ventilation grills or ducts.

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.

Example:

Gas water heater 40,000 Btu/Hr

Vent free heater + 18,000 Btu/Hr

Total = 58,000 Btu/Hr

3. Add the Btu/Hr of all fuel burning appliances in the space.

Vent-free heater Btu/Hr

Gas water heater* Btu/Hr

Gas furnace Btu/Hr

Vented gas heater Btu/Hr

Gas Fireplace logs 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)

58,000 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.

B. Vent room directly to the outdoors. See Ventilation Air From Outdoors.

C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.

Figure 2 -Ventilation Air from Inside Building

Figure 3 -Ventilation Air from Outdoors

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/ANSI 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-con-

trolled power vent.. Heated air entering the attic will

activate the power vent..

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, ANSI Z223.1/NFPA 54, Air for Combustion and Ventilation, or

applicable local codes.

Procom ML170EPC Specifications Page 6

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Procom ML170EPC Specifications Page 6

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