Procom MD100TBA Installation Manual download pdf (Page 8)

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200000-01B8

Use this work sheet to determine if you have

a conned or unconned space.

Space: Includes the room in which you will

install heater plus any adjoining rooms with

doorless passageways or ventilation grills

between the rooms.

1. Determine the volume of the space (length

x width x height).

Length x Width x Height =__________

cu. ft. (volume of space)

Example: Space size 20 ft. (6.1 m)

(length) x 16 ft. (4.88 m) (width) x

8 ft. (2.44 m) (ceiling height) = 2560 cu.

ft. (72.49 m

3

) (volume of space)

If additional ventilation to adjoining room

is supplied with grills or openings, add the

volume of these rooms to the total volume

of the space.

2. Multiply the space volume by 20 to deter-

mine the maximum Btu/Hr the space can

support.

________(volume of space) x 20 =

(Maximum Btu/Hr the space can support)

Example: 2560 cu. ft. (72.49 m

3

) (volume

of space) x 20 = 51,200 (maximum Btu/

Hr the space can support)

3. Add the Btu/Hr of all fuel burning appli-

ances in the space.

Vent-free heater _________ Btu/Hr

Gas water heater* _________ Btu/Hr

Gas furnace _________ Btu/Hr

Vented gas heater _________ Btu/Hr

Gas replace logs _________ Btu/Hr

Other gas appliances*+ _______ Btu/Hr

Total = ________ Btu/Hr

* Do not include direct-vent gas appli-

ances. Direct-vent draws combustion

air from the outdoors and vents to the

outdoors.

AIR FOR COMBUSTION AND VENTILATION

30,000

26,000

56,000

Conned and Unconned Space

The National Fuel Gas Code, ANSI Z223.1/

NFPA 54 denes a conned space as a space

whose volume is less than 50 cubic feet per

1,000 Btu/hr (4.8 m

3

per kw) of the aggregate

input rating of all appliances installed in that

space and an unconned space as a space

whose volume is not less than 50 cubic feet per

1,000 Btu/hr (4.8 m

3

per kw) of the aggregate

input rating of all appliances installed in that

space. Rooms communicating directly with the

space in which the appliances are installed*,

through openings not furnished with doors, are

considered a part of the unconned space.

* Adjoining rooms are communicating only if

there are doorless passageways or ventilation

grills between them.

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Determining if You Have a Conned or Unconned Space

Example:

Gas water heater __________ Btu/Hr

Vent-free heater + _________ Btu/Hr

Total = _________ Btu/Hr

4. Compare the maximum Btu/Hr the space

can support with the actual amount of Btu/

Hr used.

_______Btu/Hr (maximum can support)

_______Btu/Hr (actual amount 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 conned

space because the actual Btu/Hr used is more

than the maximum Btu/Hr the space can sup-

port. 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 9.

B. Vent room directly to the outdoors. See

Ventilation Air From Outdoors, page 9.

C. Install a lower Btu/Hr heater, if lower Btu/

Hr size makes room unconned. If the ac-

tual 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.

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