5
a. Direct communication with outdoors. Minimum
free area of 1 square inch per 4,000 Btu per hour
input of all equipment in space.
b. Vertical ducts. Minimum free area of 1 square
inch per 4,000 Btu per hour input of all
equipment in space. Duct cross-sectional area
shall be same as opening free area.
c. Horizontal ducts. Minimum free area of 1
square inch per 2,000 Btu per hour input of all
equipment in space. Duct cross-sectional area
shall be same as opening free area.
Alternate method for boiler located within confined
space.
Use indoor air if two permanent openings
communicate directly with additional space(s) of
sufficient volume such that combined volume of all
spaces meet criteria for unconfined space. Size each
opening for minimum free area of 1 square inch per
1,000 Btu per hour input of all equipment in spaces,
but not less than 100 square inches.
7. Ventilation Duct Louvers and Grilles. Equip outside
openings with louvers to prevent entrance of rain
and snow, and screens to prevent entrance of insects
II. Unpack Boiler
CAUTION
Do not drop boiler. Do not bump boiler jacket
against floor.
A.
Move boiler to approximate installed position.
B.
Remove all crate fasteners.
C.
Lift outside container and remove with all other
inside protective spacers and bracing. Save two of the
wooden slats from the container sleeve for use in Steps
E and F.
D
. Remove all boiler hold-down fasteners.
E.
Tilt the boiler to one side and slide a wooden slat under
the two raised feet.
F.
Tilt the boiler to the other side and slide another
wooden slat under the two raised feet.
G.
Slide the boiler forward or backward off the skid using
the two wooden slats as runners.
H.
Move boiler to its permanent location.
I. Pre-Installation (continued)
and rodents. Louvers and grilles must be fixed in
open position or interlocked with equipment to open
automatically before burner operation. Screens must
not be smaller than ¼ inch mesh.
Consider the blocking effect of louvers, grilles and
screens when calculating the opening size to provide
the required free area. If free area of louver or grille
is not known, assume wood louvers have 20-25
percent free area and metal louvers and grilles have
60-75 percent free area.
I
.
Do not install boiler where gasoline
or other
flammable vapors or liquids, or sources of
hydrocarbons (i.e. bleaches, cleaners, chemicals, sprays,
paint removers, fabric softeners, etc.) are used or stored.
