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Fig. #8245
CLEARANCES
ALL HEATERS
For clearances from combustible surfaces, see chart
below. We require a minimal vertical clearance of three
feet between the upper surface of the flue outlet to a non-
combustible material.
MINIMUM CLEARANCES FROM COMBUSTIBLE
CONSTRUCTION
INDOOR HEATERS
Top - 24" *Vent - 6"
Back - 24"
Right Side - 24"
Left Side - 24"
OUTDOOR HEATERS (926-1758)
Top - unobstructed
Back - 24"
Right side - 24"
Left Side - 24"
For servicing provide a front clearance as shown below
Model 926/962-758/1826 - 24"
Model 2100-4001 - 48"
*Vent includes factory supplied drafthood and does not
include field supplied vent systems above the draft-
hood. On Models 2100-4001 drafthood is built into
boiler.
For servicing, provide at least 24" in front of the heater
on Models 926-1826 & 48" in front of the heater on Models
2100-4001 for burner tray removal, and at least 18" on the
right side of the heater to inspect and delime the heat
exchanger.
OUTDOOR HEATERS (MODELS 926-1758)
These heaters are design certified for outdoor
installation,when equipped with the approved top desig-
nated for outdoor use. Heaters must not be installed
under an overhang of less than three (3) feet from the top
of the heater. Three (3) sides must be open in the area
under the overhang. Roof water drainage must be diverted
away from the heaters installed under overhangs with the
use of gutters.
WARNING: The heater shall not be located in an
area where water sprinklers, or other devices, may
cause water to spray through the cabinet louvers
and into the heater. This could cause heavy internal
rusting or damage some electrical components,
and this would void the warranty.
The point from where the flue products exit the heater
must be a minimum of four (4) feet below, four (4) feet
horizontally from or one (1) foot above any door, window
or gravity inlet to a building. The top surface of the heater
shall be at least three (3) feet above any forced air inlet,
or intake ducts located within ten (10 ) feet horizontally.
HIGH WIND CONDITIONS (OUTDOOR UNITS ONLY)
In areas where high winds are frequent, it may be
necessary to locate the heater a minimum of 3' from
high vertical walls, or install a wind break so the heater
is not in direct wind current.
INDOOR HEATERS
The design is also certified for indoor installation
when equipped with approved drafthood. Locate heater
as close as practical to a chimney or gas vent.
COMBUSTION AIR (INDOOR UNITS ONLY)
The heater must have both combustion and venti-
lation air. Openings must not be obstructed. Minimum
requirements are as follows:
CAUTION: Combustion air must not be contaminated
by corrosive chemical fumes which can damage the
heater and void the warranty.
1. Free combustion air 1 sq. in. per 1000 BTU
input within 12" of the floor.
2. Free ventilation air 1 sq. in. per 1000 BTU input
within 12" of the ceiling level.
NOTE: If the room the heater is installed in is located
against an outside wall and air openings communicate
directly with the outdoors, the openings may be 1/4 the
size specified above (ANSI Z223.1/NFPA 54, latest
edition)
4
foot
Minimum
4
foot
Minimum
1
foot
Minimum
4
foot
Minimum
3
foot
Minimum
10
foot
Minimum
Forced Air Inlet