State Industries ULTRA FORCE 101 User Manual

Page 19

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19

Alternatively a single permanent opening, commencing within 12

inches (300 mm) of the top of the enclosure, shall be provided.

See Figure 11. The water heater shall have clearances of at

least 1 inch (25 mm) from the sides and back and 6 inches (l50

mm) from the front of the water heater. The opening shall directly

communicate with the outdoors or shall communicate through a

vertical or horizontal duct to the outdoors or spaces that freely

communicate with the outdoors and shall have a minimum free

area of the following:
1. 1 square inch per 3000 btu/hr (733 mm2 per kW) of the total

input rating of all appliances located in the enclosure, and

2. Not less than the sum of the areas of all vent connectors in

the space.

outdoor air through two horiZontal ducts

figure 12

The confined space shall be provided with two permanent

horizontal ducts, one commencing within 12 inches (300 mm) of

the top and one commencing within 12 inches (300 mm) of the

bottom of the enclosure. The horizontal ducts shall communicate

directly with the outdoors. See Figure 12.
Each duct opening shall have a minimum free area of 1 square

inch per 2,000 btu/hr (1100 mm2 per kW) of the aggregate input

rating of all appliances installed in the enclosure.
When ducts are used, they shall be of the same cross sectional

area as the free area of the openings to which they connect.

The minimum dimension of rectangular air ducts shall be not less

than 3 inches.

fresh air openings for confined spaces

The following instructions shall be used to calculate the size,

number and placement of openings providing fresh air for

combustion, ventilation and dilution in confined spaces. The

illustrations shown in this section of the manual are a reference

for the openings that provide fresh air into confined spaces

only.

do not refer to these illustrations for the purpose of vent

installation. See Venting installation on page 22 for complete

venting installation instructions.

outdoor air through two openings

figure 10

The confined space shall be provided with two permanent

openings, one commencing within 12 inches (300 mm) of the top

and one commencing within 12 inches (300 mm) of the bottom of

the enclosure. The openings shall communicate directly with the

outdoors. See Figure 10.
Each opening shall have a minimum free area of 1 square inch

per 4,000 btu/hr (550 mm2 per kW) of the aggregate input rating

of all appliances installed in the enclosure. Each opening shall

not be less than 100 square inches (645 cm2).

outdoor air through one opening

figure 11

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