Install Instructions (Venting)

5.0 Manifold Combustion Air

5.3 Horizontal Air Termination

The common combustion air manifold must termi-

nate on a horizontal/side wall using a 90 degree

elbow pointed downward.

- The inlet of the common combustion air termination

lbow must include a corrosion resistant field sup-

plied bird screen.

- The edge of the combustion air termination cou-

pling must extend 1” (2.5 cm) beyond the finished

exterior wall as shown in Fig. 6 on page 19.

- The bottom of the common combustion air termi-

nation (inlet) must be located 12” (30.5 cm) mini-

mum above grade/highest anticipated snow level.

- The common combustion air termination must be a

minimum of 3 feet (0.9 m) below (vertically) any

appliance vent termination within 10 feet (3 m) hor-

izontally.

- The common combustion air termination must be a

minimum of 3 feet (0.9 m) horizontally from any

appliance vent termination.

- Avoid locating the common combustion air termi-

nation in a location where prevailing winds could

affect the performance of the boilers or cause recir-

culation of flue gases, such as inside corners of

buildings, near adjacent buildings, vertical surfaces,

window wells, stairwells, alcoves, courtyards, or

other recessed areas. The common air termination

must be installed a minimum of 6 feet horizontally

from any such locations.

- Locate the combustion air termination in a manner

so as to protect from damage from foreign objects,

such as stones, balls, buildup of leaves or sedi-

ment.

5.4 Installation Guidelines

- Use perforated metal strap hangers or equivalent

ipe hangers suitable for plastic pipe to support the

common air manifold. Hangers must be placed at a

aximum of every 5 ft [1.5 m] of horizontal and ver-

tical run of piping. A support must be placed at every

boiler and at every change in direction vertically or

horizontally.