Kenmore 3E W.65, 4EW.90, 3EW.75, 5EW1.75, 5EW2.00, 5EWL.20, 4EW1.50 owner manual Duct Size

B. All Air from Outdoors:

The

confined

space

shall

be provided

with

two permanent

openings,

one

commencing

within 12

inches

of the

top

and

commencing

within

12

inches

of 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.

1.When directly communicating with the outdoors, each opening shall have a minimum free area of

one square inch per 4,000 Btu per hour of total input rating of all equipment in the enclosure.

2.When communicating with the outdoors through vertical ducts, each opening shall have a minimum

flee, area of one square inch per 4,000 Btu per hour of total input rating of all equipment in the enclosure.

3.When communicating with the outdoors through horizontal ducts, each opening shall have a

minimum free area of one square inch per 2,000 Btu per hour of total input rating of all equipment in the enclosure.

4.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 three inches.

FRESH

AIR

FRESH AIRDUCTCAPACITIESFORDUCTSSUPPLYINGFRESH_RTOBOILERINTIGHTLY

CONSTRUCTED HOUSES

Fresh	Air	¼" Mesh Screen	Wood Louvers	Metal Louvers
Duct	Size	(Btuh)*	(Btuh)*	(Btuh)*
3J/2 '" x 12"		144,000	36,000	108,000
8" x 8"		256,000	64,000	192,000
8" x	12"	384,000	96,000	288,000
8"x	16"	512,000	128,000	384,000

*Btuh = British Thermal Units per hour based on opening covered by ¼" mesh screen, wood louvers, or metal louvers.