Oxbox J951X D Series, Installation Instructions Manual

5

•  Exposure to the following substances in the combustion 

air supply may require outdoor air for combustion:

Permanent wave solutions

Chlorinated waxes and cleaners

Chlorine based swimming pool chemicals

Water softening chemicals

De-icing salts or chemicals

Carbon Tetrachloride

Halogen type refrigerants

Cleaning solvents (perchloroethylene)

Printing inks, paint removers, varnishes, etc.

Hydrochloric Acid

Cements and glues

Antistatic fabric softeners

Masonry acid washing materials

Heating Load

This furnace should be sized to provide the design heating 

load requirement. Heating load estimates can be made 

using approved methods available from Air Conditioning 

Contractors of America (Manual J); American Society of 

Heating, Refrigerating, and Air Conditioning Engineers; or 

other approved engineering methods. 

Excessive oversizing 

of the furnace could cause the furnace and/or vent to 

fail prematurely.

The ductwork should be appropriately sized to the capacity of 

the furnace to ensure its proper airflow rating. For installations 

above 2,000 ft., the furnace should have a sea level input 

rating large enough that it will meet the heating load after 

deration for altitude.

Installation in a Garage

 WARNING:

Do not place combustible material on or against 

the furnace cabinet or within 6 inches of the 

vent pipe. Do not place combustible materials, 

including gasoline or any other flammable vapors 

and liquids, in the vicinity of the furnace.

This gas-fired furnace may be installed in a residential garage 

with the provision that the burners and igniter are located no 

less than 18 inches (457mm) above the floor. The furnace 

must be located or protected to prevent physical damage 

by vehicles.

Clearances to Combustible Materials

This furnace is Design Certified in the U.S. and Canada 

by CSA International or Underwriter’s Laboratories for the 

minimum clearances to combustible materials. 

NOTE:

The furnace is listed for installation on combustible or non-

combustible flooring. However, wood is the only combustible 

flooring allowed for installation. Downflow models must use 

the appropriate subase kit when installing over a wood floor. 

To obtain model number and specific clearance information, 

refer to the furnace rating plate, located inside of the furnace 

cabinet.
Access for positioning and servicing the unit must be 

considered when locating unit. The need to provide clearance 

for access to panels or doors may require clearance distances 

over and above the requirements.  

Allow 24 inches minimum 

clearance from the front of the unit. However 36 inches 

is strongly recommended. 

See 

Figure 1

 for minimum 

clearance requirements.

Operation of Furnace During Construction

 CAUTION:

Failure to follow these instructions will void the 

factory warranty and may significantly reduce 

the life or the performance of the furnace, and/

or result in other unsafe conditions. It is the 

responsibility of the installing contractor to insure 

these provisions are met.

Operating gas furnaces in construction environments can 

cause a variety of problems with the furnace. Proper use 

of commercial portable space heating equipment during 

construction is recommended. This gas furnace may be 

used during construction if it is not in violation of any 

applicable codes and the following criteria are met:

•  The installation must meet all applicable codes. The furnace 

must be permanently installed according to the instructions 

supplied with the furnace.  This includes the electrical supply, 

gas piping, duct work, and venting. The furnace must be 

controlled by a room thermostat properly installed according 

to the instructions supplied with the furnace and thermostat. 

The installation must include a properly installed air filter in 

the return air duct, sealed to the furnace with no by-pass air. 

The filter must be inspected frequently and replaced when 

necessary.

•  The furnace input rate and air temperature rise must be 

checked and verified to be within the acceptable ranges as 

marked on the furnace nameplate.

•  Before occupying the structure: The air filter must be replaced 

or cleaned, the duct work must be inspected and cleaned of 

any construction debris, and the furnace must be cleaned and/

or repaired if found to be dirty, damaged, or malfunctioning in 

any way by a qualified HVAC technician. The furnace shall 

be inspected and approved by applicable local authority even 

if this requires redundant inspections.

•  Serial numbers for furnaces used during construction must 

be submitted in writing (fax and email also acceptable). This 

information will be used to track the long-term affects of the 

use during construction on furnaces. Proof of this submittal 

CLEARANCES TO COMBUSTIBLE MATERIALS

Left Side..................0 Inches Top ..........................0 Inches

Right Side ...............0 Inches Front ......................

†

4 Inches

Vent .........................0 Inches Back ........................0 Inches

†Allow 24 in. minimum clearance for servicing. Recommended clearance 

is 36 in.

Figure 1. Minimum Clearances to 

Combustible Materials

TOP

FRONT

UPFLOW

APPLICATIONS

HORIZONTAL

APPLICATIONS

VENT

TOP

FRONT

DOWNFLOW

APPLICATIONS

SIDE

TO

P

BO

TT

OM

VENT

VENT

FRONT

BACK

BACK

SIDE

LEFT SIDE

LEFT SIDE

RIGHT SIDE

RIGHT SIDE