(a) Provisions shall be included within the system to supply air for mechanical ventilation that may be necessary to meet the requirements of Chapter 1389 and the make-up air to offset exhaust systems, hoods and other means of exhausting air from the building. The make-up outside air shall be in quantities sufficient to prevent negative pressure from developing in the building of a magnitude that would result in unsatisfactory or improper fuel combustion and the venting of the products of combustion.
(b) Make-up air and/or combustion air for heating units may be by gravity inlet, sized in accordance with good engineering practice, and of a quantity required for the equipment, or by the induction of outside air into the fan inlet side of the distribution system, and it shall be in sufficient quantities to assure proper fuel combustion. Fuel-burning equipment shall be installed in a location not subject to negative pressure or in a room or enclosure separating the equipment from other spaces in the building.
(c) Combustion air may be induced into air-handling systems which supply the ventilation air requirements, provided that a sufficient quantity is distributed to the fuel-burning equipment location. No air return to the air circulation system is permitted from the space in which the equipment is located.
(d) Combustion air for high-efficiency “condensing” or “pulse” heating units, which require balanced pressure for combustion and flue venting, shall be ducted or piped directly to and from outside the building to the unit connections in accordance with the manufacturer's requirements. The low temperature products of combustion shall be ducted or piped directly to the outside as required.
(1) Combustion air intakes and low temperature flue exhaust shall not be located in the front of a building or on the front slope of the roof. Termination shall be located a minimum of five feet from any window or door in a horizontal dimension. No low-temperature vent shall be installed directly below a window or other opening to the building. Combustion air terminations shall be in accordance with NFiPA 54 and 211 and Ohio Basic Building Code (Mechanical), Article 10 [OAC 4101:2-41] (refer to Appendix A).
(2) Air inlet and exhaust terminations shall be in locations and placed sufficiently above grade to provide unrestricted operation. Openings shall be protected or terminated in a manner as to prevent water, snow, insects or animals from entering through the pipe or duct.
(3) The combustion and flue exhaust air assembly for self-contained, separated combustion, gas burning units may be installed directly to the outside of a building. The assembly shall be a minimum of three feet above grade and shall not be located beneath a window.
(e) An exhaust system air discharge termination shall be installed directly to the outside. No high-humidity or contaminated air shall be discharged into an attic or other unoccupied space, even though such space may be ventilated to the outside.
(Ord. 1992-101. Passed 1-14-92.)