(A) Oil-fired floor furnaces shall be specifically approved by the Department for services in direct contact with combustible floors in which they may be installed.
(B) Fixed ventilation by means of a duct or grille arranged to supply air from a permanently ventilated attic or underfloor space, shall be provided to any confined space which encloses the floor furnace. The duct or grille shall be screened and have a free area at least twice the free area of the vent collar of the floor furnace or one square inch per 1,000 inch per 1,000 B.T.U. per hour of oil input, whichever is the greater, and shall be installed in such a manner as to ensure proper combustion.
(C) The following are requirements that will serve in properly placing the furnace or furnaces to serve one story.
(1) No floor furnace shall be installed in the floor of any aisle or passageway of any auditorium, public hall or place of assembly or in an exit-way from any such room or space.
(2) With the exception of wall-register models, a floor furnace shall not be placed closer than six inches to the nearest wall and wall-register models shall be placed closer than six inches to a corner.
(3) The furnace shall be so placed that a door, drapery or similar object cannot be nearer than 12 inches to any portion of the register of the furnace.
(4) Generally speaking, the more central the location, the better, favoring slightly the sides exposed to the prevailing winter winds.
(5) The floor around the furnace shall be braced and headed with a framework of material not lighter than the joists.
(6) Means shall be provided to support the furnace when the floor grille is removed.
(7) The lowest portion of the floor furnace shall have at least six-inch clearance from the general ground level, except that where the lower six-inch portion of the floor furnace is sealed by the manufacturer to prevent entrance of water, the clearance may be reduced to not less than two inches. When these clearances are not present, the ground below and to the side shall be excavated to form a “basin-like” under the furnace so that the required clearance is provided beneath the portion of the furnace. A 12-inch clearance shall be provided on all sides except the control side which should have an 18 inch clearance.
(8) Provisions shall be made for an access door to the floor furnace by means of an opening in the foundation wall of at least 18 by 24 inches and a trap door of at least 24 inches by 24 inches, located at some convenient point, and a clear and unobstructed passageway to the floor furnace of at least 18 inches high by 24 inches wide.
(9) Whenever the excavation exceeds 12 inches or water seepage is likely, a pit made of concrete, water-proof, not less than three and three-quarters inches thick and extending four inches above grade level shall be used. The pit shall be not less than six feet by six feet inside dimension, with at least two and one-half foot clearance on the control side and clearance on all other sides not less than six inches.
(10) Floor furnaces shall be protected, where necessary, against severe wind conditions.
(11) Listed oil floor furnaces may be installed in an upper floor provided the furnace assembly projects below into a utility room, closet, garage or similar nonhabitable space. In such installations, the floor furnace shall be enclosed completely (entirely separated from the nonhabitable space) with means for air intake to meet the provisions of this section, with access facilities for servicing on the control side, with minimum furnace clearance of six inches to all sides and bottom, and with the enclosure constructed of Portland Cement plaster on metal lath or material of equal fire resistance.
(12) Registers shall not be covered with combustible materials and the floor immediately surrounding the furnace shall be reasonably level.
(13) All floor furnaces, including those having single or dual wall register outlets, shall be installed as approved without alterations, extensions or changes of any kind in the furnace.
(Ord. 19, passed 1-7-1955)