Yukon Eagle BIG JACK BJ90, Owner'S Manual

Page: 11 / 24

11
fURNACE LoCAtEd IN CoNfINEd SPACE
When the furnace is in a utility room, install two open grilles in a
wall or door opening to the rest of the house. One grille will supply
combustion air. Locate it near the floor. The other grille is for ven-
tilation. Locate it close to the ceiling. Each grille must have a free
area of not less than one square inch for each 1000 BTU/hr. of the
total input rating of all the appliances in the confined space. (See
Fig. 16)
FOR EXAMPLE: Your furnace is rated at 150,000 BTU per hour.
The water heater is rated 30,000 BTU per hour. The total is
180,000 BTU per hour.
You need two grilles, each with 180 square inches of free opening.
Metal grilles have about 60% free (open) area, so you need two
metal grilles with 300 square inches each of louvered area. The
height should be about half the width.
fRESH AIR dUCt CAPACItIES
Fresh air duct capacities for duct supplying fresh air.
BtU Per Hour Input*
1/4 in. Mesh Wood Metal
Screen Louvers Louvers
Size BTU BTU BTU
3-1/4 x 12 in. 144,000 36,000 108,000
8 in. round 200,000 50,000 150,000
8 x 12 in. 382,000 96,000 288,000
8 x 16 in. 512,000 128,000 384,000
* Based on opening covered by 1/4 inch mesh screen, wood or metal louvers.
WARNING
Enough air insures proper combustion and assures that no haz-
ard will develop due to the lack of oxygen.
NotE
If you have a fireplace, a kitchen fan, bath fan or water heater
that vents to the outside, add enough duct size to your fresh air
requirements to accommodate their air needs.
WARNING
Return air MUST NOT be drawn from inside the room where
the furnace is located.