SECTION 3: CLEARANCES
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 4
FRONT OF FURNACE
Model Top (in/m) Back (in/m) Sides (in/m) Alcove (in/m) Closet (in/m) Duct (in/m)
AL 6 .0 / 152.4 0.0 / 0.0 0.0 / 0.0 18.0 / 457.2 6.0 / 152.4 0.0 / 0.0
Clearances for Service
Access for servicing is an important factor in the location of any
furnace. Provide a minimum of 24 inches (609.6 mm) in front
of the furnace for access to the control box, heating elements,
and blower. This access may be provided by a closet door or by
locating the furnace so that a wall or partition is not less than 24
inches(609.6mm) from the front access door.
Clearance to Combustibles
This furnace is approved for the clearance to combustible mate-
rial from the furnace exterior and ducts as shown in Table 4 and
Figure 2.
Provisions must be provided for the air in the living spaces to
return to the air handler. Failure to comply may cause a reduction
in the amount of return air available to the blower, causing
reduced air-flow. If a cooling coil is installed on the furnace,
the pressure drop of the coil must be taken into account when
selecting the furnace size and selecting the blower motor speed
taps to assure proper air flow for the system in both the heating
and cooling modes. Reduced air-flow may result in insufficient
heating or cooling of the living space. Reduced air flow may also
cause the air handler to cycle on the heating over-temperature
limit and premature heating element failure in the heating mode
or ice formation on the coil in the cooling mode.
For the furnace to work properly, a closet or alcove where it is
installed must have a minimum total free area opening for the
return air as shown below.
Furnaces With 1/3 HP Blower Motor
• Minimum 200 in² (129,032 mm²) free area opening
• Use Return Grille, A/C Coil Cabinet, or any return grille with a
minimum 200 in² (129.032 mm²) free area opening
Furnaces With 1/2 HP Blower Motor
• Minimum 250 in² (161,290 mm²) free area opening
• Use Return Grille, A/C Coil Cabinet, or any return grille with a
minimum 250 in² (161,290 mm²) free area opening
Figure 2: Clearances to Combustibles
Table 4: Clearances to Combustibles
Figure 3: Service Access Clearances
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