801.23.5 Positioning.

Barometric 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 any part of the appliance, adjacent construction or installation hardware.

801.24 Obstructions.

Devices or items that protrude into, impede or restrict the flow of vent gases shall not be installed in a vent connector, chimney, or vent.

801.25 Outdoor chimneys and vents.

Outdoor portions of chimneys or vents shall be provided with integral R-8 insulation or be provided with an R-8 insulation enclosure, where exposed to the outdoors for more than 5 feet (1524 mm).

Section MC 802: Vents

802.1 General.

Vent systems shall be listed and labeled or field fabricated in accordance with NFPA 211. Type L vents shall be tested in accordance with UL 641.

802.2 Vent application.

The application of vents shall be in accordance with Table 802.2.

Table 802.2
Vent Application

 

Vent Types	Appliance Types
Type L oil vents	Oil-burning appliances listed and labeled for venting with Type L vents; gas appliances listed and labeled for venting with Type B vents.

 

802.3 Installation.

Vent systems shall be sized, installed and terminated in accordance with the vent and appliance manufacturer's instructions.