Installing Your Furnace
10
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 4000 Btu/hr. for the total of all appliances. The required area
is shown on page 11, Fig. 9 under the column for (40,000).
Fig 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.
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, 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 Btuh combined input
of appliances in one room if combined input exceeds 100,000
Btuh.
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 60,000 Btu/hr. The water
heater is rated at 30,000 Btu/hr. The total is 90,000 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.
Refer to figure as shown on Page 11, Fig. 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 60,000 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.
If opening connects directly to, or within vertical ducts, the free
area of each opening must be at least 1 square inch per 4000
Btu/hr. combined input of appliances in area.
If horizontal ducts are used, the free area of each opening must
be at least 1 square inch per 2000 Btu/hr. combined input of
appliances in area.
(12 pages)
(33 pages)
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