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INSTALLING YOUR FURNACE
FIGURE 4 – DRAFT HOOD SPILLAGE
VENT PIPE
DRAFT HOOD
OPENING
(match or
smoke pen)
TYPICAL WATER
HEATER
4.
Spillage means air starvation and a fresh air duct or air
intakes must be installed to provide air directly to the
furnace or other gas appliance.
D.
If spillage exists or when the furnace is in a building
of tight construction where the windows and doors
are weather stripped, air for combustion and ventilation
must be obtained from outdoors or space open to the
outdoors.
Provide an opening(s) having a total free area of 1 square inch
per 4,000 BTU/hr. for the total of all appliances. The required
area is shown on Figure 9.
FIGURE 5 - FRESH AIR DUCT
AIR GRILLS TO STUD SPACE
HOLES FROM VENTILATED
CRAWL SPACE INTO STUD SPACE
HOLES IN BOTTOM ON BACK OF FURNACE INTO OPEN
STUD SPACE OR CRAWL SPACE
Figure 5 shows a typical duct going into ventilated crawl
space or attic.
1.
Duct must terminate at a point not more than 1 foot
above the floor.
2. Duct size must be at least 1 inch of free area for each
4000 BTU/hr. of input of all appliances in area.
10
COUNTERFLOW TOP VENT GAS WALL HEATER
VENT PIPE
DRAFT HOOD
OPENING
(match or
smoke pen)
WALL
FURNACE
HOLES FROM VENTILATED
ATTIC INTO STUD SPACE
12ʺ MAX FROM FLOOR
EXAMPLE 2
FURNACE LOCATED IN CONFINED SPACE
If furnace is installed in a confined space, it must be provided
with free air for proper combustion and ventilation of flue
gases by one of the following methods.
A.
ALL AIR FROM INSIDE BUILDING:
If the confined space adjoins an unconfined space, provide
two permanent openings, one within 12 inches of the top and
one within 12 inches of the bottom of the room connecting
directly to unconfined space. Each opening must have a
free area of at least 100 square inches or 1 square inch per
1000 BTU/hr. combined input of appliances in one room if
combined input exceeds 100,000 BTU/hr.
WARNING: Danger of property damage, bodily injury
or loss of life. The adjoining unconfined space must have
adequate air infiltration as defined in EXAMPLE 1.
FOR EXAMPLE: Your furnace is rated at 50,000 BTU/hr. The
water heater is rated at 30,000 BTU/hr. The total is 80,000
BTU/hr. You need two grilles, each with 100 square inches
of free opening. Metal grilles have about 60% free area, so
you need two metal grilles each with 160 square inches of
louvered area.
FIGURE 6 - MINIMUM AREA IN SQUARE FEET
4,000 BTU/hr. per
square inch opening
Rectangular
Round duct dia.
square duct size
4ʺ
3ʺ x 3ʺ
4ʺ
3ʺ x 3ʺ
4ʺ
3ʺ x 4ʺ
4ʺ
3ʺ x 4ʺ
4ʺ
3ʺ x 5ʺ
4 ½ʺ
3ʺ x 5ʺ
* Can be two or more rooms joined by ventilation grills.
Refer to figure as shown on Page 11, Figure 7, which shows
grille installation. Using the previous example, the two
connecting rooms plus the closet must equal at least 500 sq.
feet to handle the combined input 50,000 plus 30,000.
B. ALL AIR FROM OUTDOORS:
If confined space doesn't adjoin an unconfined space then air
must be provided from outdoors or spaces open to outdoors
such as attic or crawl space.
Provide two permanent openings, one within 12 inches of top,
one within 12 inches of bottom of room connecting directly, or
by using ducts, with the outdoors or areas open to outdoors.
*Uncontained space
min. area in sq. ft.
Max.
8ʼ ceiling height
BTU/hr input
188
30,000
35,000
219
250
40,000
45,000
281
50,000
312
375
60,000
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