Rinnai RS100 Manuel d'utilisateur télécharger pdf (Page 34)

Installation & Servicing Instructions Rinnai Q-Series

6.7.8 Room Air System (indoor combustion air)

Conﬁ ned Space:

(Small Room, Closet, Alcove, Utility Room, Etc.)

A conﬁ ned space is deﬁ ned in the NFPA #54 as "a space whose volume is less than 50 cubic feet per

1000 Btu/hr (4.8 m3 per kW per hour) of the aggregate input rating of all appliances installed in that

space." A conﬁ ned space must have two combustion air openings. Size the combustion air openings

based on the BTU input for all gas utilization equipment in the space and the method by which

combustion air is supplied:

Using indoor air for combustion

Using outdoor air for combustion

Louvers and Grills

When sizing the permanent opening as illustrated in Figure 1, consideration must be taken for the design

of the louvers or grills to maintain the required free area required for all gas utilizing equipment in the

space. If the free area of the louver or grill design is not available, assume wood louvers will have 25%

free area and metal louvers or grills will have 75% free area. Under no circumstance should the louver,

grill or screen have openings smaller than ¼”.

Example:

Wood: 10 in x 12 in x 0.25 = 30 in2

Metal: 10 in x 12 in x 0.75 = 90 in2

Location

To maintain proper circulation of combustion air two permanent openings (one upper, one lower) must be

positioned in conﬁ ned spaces. The upper shall be within 12 inches of the conﬁ ned space and the lower

opening shall be within 12 inches of the bottom of the conﬁ ned space. Openings must be positioned as to

never be obstructed.

Combustion air provided to the appliance should not be taken from any area of the structure that may pro-

duce a negative pressure (i.e. exhaust fans, powered ventilation fans).

Figure 1

BOILER

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Rinnai RS100 Manuel d'utilisateur Page 34