Kenmore 153.335916, L53.335816, 153.335942, 153.335845, 153.335962 Installation Instructions contd

Installation Instructions (cont'd)

Combustion Air and Ventilation

for Appliances Located in Unconfined Spaces

Unconfined Space is a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour of the aggregate input rating of all appli- ances installed in that space. Rooms communicating directly with the space in which the appliances are installed, through openings not fur_ nished with doors, are considered a part of the unconfined space.

In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation and dilution of flue gases. However, in buildings of tight construction (for example, weather stripping, heavily insulated, caulked, vapor barrier, etc.), additional air may need to be ])rovided using the methods described in Combustion Air and Ventilation for Appliances Located in Confined Spaces.

Combustion Air and Ventilation for Appliances Located in Confined Spaces

Confined Space is a space whose volume is less than 50 cubic feet per

1,000 Btu per hour of the aggregate input rating of all appliances

installed in that space.

a. ALL AIR FROM INSIDE BUILDINGS:

(See Page 8 Figure 1, and Figure 5 below)

The confined space shall be provided with two permanent open-

ings communicating directly with an additional room(s) of suffi- cient volume so that the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utiliza- tion equipment installed in the combined space shall be considered in making this determination. Each opening shall have a minimum free area of one square inch per 1,000 BTU per hour of the total input rating of all gas utilization equipment in the confined space, but not less than 100 square inches. One opening shall commence

1.When directly communicating with the outdoors, each opening shall have a minintum free area of 1 square inch per 4,000 BTU per hour of total input rating of all equipment in the enclosure. (See Figure 6.)

2.When communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 BTU per hour of total input rating of all equipment in the enclosure. (See Figure 7.)

	_NTILAT_N LOUVERS
		{_ch cad o_a_m)
		AIR OUTLEt
	_TDOOAInsINLETDUCT
	_VEN_	TO
Figure 7 ]	.......... t,,
	',',',',',',',%'!	i ll:J

3.When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 BTU per hour of total input rating of all equip- ment in the enclosure. (See Figure 8.)

within 12 inches of the top and one commencing within 12 inches of the bottom of the enclosure.

Figure 8 ]

	_VENTTO
OUTLET _1_ DUCT	OUTDOORS
	WATER
	HE_TE_

iiirlll,,,,,llll

,_,,,,_,,,rll_llll

_L

Figure 5 I

b. ALL AIR FROM OUTDOORS: (see Figures 6-8)

The confined space shall be provided with two permanent open- ings, one commencing within 12 inches of the top and one com- mencing within 12 inches from the bottom of the enclosure. The openings shall communicate directly, or by ducts, with the

outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

, ii

j Figure 6 ]	_Utlt_rlO_LOUVE.S
	\	/

4.When ducts are used, they shall be of the same cross-sectionalareaas the free area of the openings to which they connect. The mini- mum short side dimension of rectangular air ducts shall not be lessthan 3 inches. (See Figure 8.)

5.Louvers and Grilles:In calculating free area, consideration shall be given to the blocking effect of louvers, grilles or screens protect- ing openings. Screens used shall not be smaller than¼ inch mesh.

If the free area through a design of louver or grille is known, it should be used in calculating the size opening required to provide the free area specified. If the design and free area is not known, it may be assumed that wood louvers will be 20-25 percent free area

and metal louvers and grilles wi!l have 60-75 percent free area. Louvers and grilles shallbe fixed in the open _osition or inter- locked with the equipment so that they are opened automatically during equipment operation.

6.Special Conditions Created by Mechanical Exhausting or Fireplaces:Operation of exhaust fans, ventilation systems, clothes dryers or fireplacesmay create conditions requiring special atten- tion to avoid unsatisfactory operation of installed gas utilization equipment.

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