Boyertown Regal Oil Fired Furnace Variable Speed 2 Stage ECM Motor - Manual (Page 5)

Installation Clearances
Furnaces in rooms shall be installed with the clearances from combustible materials not
less than indicated in Table 1. Combustible materials are those made of or surfaced with wood,
compressed paper, plant fibers, plastics, or other material that will ignite and burn, whether flame proofed
or not, or whether plastered or not. WARNING
Place the furnace near the center of the supply and return ducts and as close to the chimney connector
as possible. Provide a solid brick or 2” thick minimum concrete pad if the furnace mounting area is
not level or if the floor can become flooded.
Table 1 Standard Installation Clearances
MODEL
Sides
“A”
Top
“B”
Front
“C”
Rear
“D”
Flooring Chimney
Connector
“E”
Plenum
Top &
Sides
HB750 2” 2” Alcove-24” 2” Combustible 18” 2”
LB750 2” 2” Alcove-24” 2” Noncombustible 18” 2”
HB1000 2” 2” Alcove-24” 2” Combustible 18” 2”
LB1000 2” 2” Alcove-24” 2” Noncombustible 18” 2”
Lowboy furnaces not listed for combustible floor may be placed on combustible floors although not
listed for such installation, provided the floor under the furnace is protected in accordance with the
requirements of accepted building code practice and NFPA 31. The furnaces shall be permitted to be
placed on combustible flooring protected by 4” hollow block placed with ends unsealed and joints
matching in such a fashion as to permit free circulation of air from side to side through the masonry.
The block must be covered with sheet metal not less than 24 gauge.
Furnaces are permitted to be installed in rooms, but not alcoves or closets, with lesser clearances to
combustible material, provided the combustible material is protected as described in Table 2 and
NFPA 31. In no case shall the clearance be such as to interfere with the requirements for combustion
air, draft regulators and accessibility.
All clearances shall be measured from the outer surface of the combustible material to the nearest
point on the surface of the appliance or chimney connector, disregarding any intervening protection
applied to the combustible material.
Spacers and ties are to be of noncombustible material. No spacer or tie shall be used directly opposite
an appliance or chimney connector.
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