802.14 Obstructions. Devices that retard the flow of vent

gases shall not be installed in a vent connector, chimney, or vent. The following shall not be considered as obstructions: (1) Draft regulators and safety controls specifically listed for

installation in venting systems and installed in accor

Where a draft hood is not supplied by the appliance manufacturer where one is required, a draft hood shall be installed, be of a listed or approved type, and, in the absence of other instructions, be of the same size as the appliance flue collar. Where a draft hood is required with a conversion burner, it shall be of a listed or approved type. [NFPA 54:12.13.2.1]

(1) Draft regulators and safety controls specifically listed for

installation in venting systems and installed in accordance with the manufacturer’s installation instructions. (2) Approved draft regulators and safety controls designed

and installed in accordance with approved engineering

(2) Approved draft regulators and safety controls designed

and installed in accordance with approved engineering methods. (3) Listed heat reclaimers and automatically operated vent

dampers installed in accordance with the manufacturer’s

(4) Vent dampers serving listed appliances installed in accor dance with Section 803.1 or Section 803.2 or other approved engineering methods. (5) Approved economizers, heat reclaimers, and recupera tors installed in venting systems of appliances not

(3) Listed heat reclaimers and automatically operated vent

dampers installed in accordance with the manufacturer’s installation instructions. (4) Vent dampers serving listed appliances installed in accor dance with Section 803.1 or Section 803.2 or other

Where a draft hood of special design is needed or preferable, the installation shall be approved and in accordance with the recommendations of the appliance manufacturer. [NFPA 54:12.13.2.2] 802.12.2 Draft Control Devices. Where a draft control device is part of the appliance or is supplied by the appliance manufacturer, it shall be installed in accordance with the manufacturer’s instructions. In the absence of manufacturer’s instructions, the device shall be attached to the flue collar of the appliance or as near to the appliance as practical. [NFPA 54:12.13.3] 802.12.3 Additional Devices. Appliances requiring controlled chimney draft shall be permitted to be equipped with listed double-acting barometric draft regulators installed and adjusted in accordance with the manufacturer’s installation instructions. [NFPA 54:12.13.4] 802.12.4 Location. Draft hoods and barometric draft regulators shall be installed in the same room or enclosure as the appliance in such a manner as to prevent a difference in pressure between the hood or regulator and the combustion air supply. [NFPA 54:12.13.5] 802.12.5 Positioning. Draft hoods and draft regulators shall be installed in the position for which they were designed with reference to the horizontal and vertical planes and shall be located so that the relief opening is not obstructed by a part of the appliance or adjacent construction. The appliance and its draft hood shall be located so that the relief opening is accessible for checking vent operation. [NFPA 54:12.13.6] 802.12.6 Clearance. A draft hood shall be located so that its relief opening is not less than 6 inches (152 mm) from a surface except that of the appliance it serves and the venting system to which the draft hood is connected. Where a greater or lesser clearance is indicated on the appliance label, the clearance shall not be less than that specified on the label. Such clearances shall not be reduced. [NFPA 54:12.13.7]