Procom ML100HBAHR User Manual

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5

VENTILATION AIR

Ventilation Air From Inside Building :

This fresh air would come from an adjoining

unconned space. When ventilating to an

adjoining unconned space, you must provide

two permanent openings: one within 12” of

the ceiling and one within 12” of the oor

on the wall connecting the two spaces (see

options 1 and 2, Figure 2). You can also re-

move door into adjoining room (see option 3,

Figure 2). 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

Example:

Gas water heater 44,000 Btu/Hr

Vent free heater + 10,000 Btu/Hr

total = 54,000 Btu/Hr

If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an

unconned space. You will need no additional fresh air ventilation.

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)

54,000 Btu/Hr(actual amount of Btu/Hr used)

The space in the above example is a conned 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 unconned

space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From

Inside Building, page 5.

B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6 .

C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconned.

Figure 2 -Ventilation Air from Inside Building

AIR FOR COMBUSTION AND

VENTILATION

Continued

WARNING: Rework worksheet,

adding the space of the adjoining

unconned space. The combined spaces

must have enough fresh air to supply all

appliances in both spaces.

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Procom ML100HBAHR – 10,000 BTU Blue Flame Ventless Ice House Heater

User Manual - Page 5