3. Add the

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

 

 

 

 

 

 

Vent-free heater

 

 

 

 

Btu/Hr

 

 

 

 

 

 

Gas water healer*

 

 

 

 

 

Btu/Hr

Example:

 

 

 

 

Gas furnace

 

 

 

 

 

Btu/Hr

 

 

 

 

 

 

 

 

Gas

water

heater

40,000

Btu/Hr

Vented gas heater

 

 

 

 

 

Btu/Hr

 

 

 

 

Vent

free

heater +

20,000

Btu/Hr

Gas Fireplace logs

 

 

 

 

 

Btu/Hr

 

 

 

 

Total

 

 

=

60,000

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) 60,000 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, 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

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.

VENTILATION AIR

Ventilation Air From Inside Building This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, 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 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/ANS Z223.1. Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts

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

Figure 2 -Ventilation Air from Inside Building

5

Page 5
Image 5
Procom ML300TGA, ML300HGA installation manual Ventilation Air From Outdoors, Ventilation AIR

ML300HGA, ML300TGA specifications

The Procom ML300HGA and ML300TGA are advanced communication solutions designed for an array of applications, particularly in sectors requiring robust and reliable wireless connectivity. Both models are designed to enhance operational efficiency through enhanced performance and pertinent features.

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