Ventingti g, Venting Into An Existing Chimney

Ventingti g

The minimum vent configuration is a 90o or Tee on a starter collar and a 24” length horizontal through an exterior wall. A cap on the end should direct the flue gases down and away from the structure. See Fig. 5.

The maximum horizontal length is 8 feet. The minimum termination height above the exterior grade is 18”. The maximum total length of any configuration is 18 feet*.

* (see venting graph on page 10 for exceptions)

NOTE: Cleanout Tee’s should always be used on the transitions to horizontal pipe to allow easy access for cleaning.

The venting graph allows for one(1) 90 deg. or Tee fitting in any configuration.

If more 90’s, T’s, or 45’s are needed the total length must be adjusted to allow for the added restriction.

Up to four (4) additional 90’s, Tee’s, or equivalent 45’s can be added as long as the overall length is adjusted in accordance with the values listed below. (See the venting graph on page 10.)

Each Vertical ----	90 deg. or T subtract 2.5 feet
Each Vertical ----	45 deg.	subtract 1.5 feet

Each Horizontal - 90 deg. or T subtract 5.0 feet

Each Horizontal - 45 deg.

subtract 2.5 feet

Venting Into An Existing Chimney

The boiler may be vented into an existing masonry or Class A metal chimney, providing that the chimney is less than 20 feet above the connector. A flue liner, no more than 4-inch diameter, must be installed, along with a termination cap and the proper flashing to seal the existing flue.

The venting Can Not be installed in a chimney serving another appliance.

The chimney should be cleaned and/or inspected before installation of the vent liner.

Due to low exhaust temperatures, and the increased possibility of condensation and creosote formation, additional measures may need taken to increase the flue temperature. One such measure would be to remove the two rear-most spiral baffles, above the burn pot, from their heat exchange tubes. Although some efficiency will be lost, an increased flue temperature will result.

The flue liner should be inspected frequently, during operation, to monitor its performance and cleanliness.

This is the minimum venting configuration. NOTE: A starting collar is needed in order to remove the units’ cleanout cover.

3” Type “L” or “PL” Vent pipe

Fig. 5

Other examples of possible installations of the venting.

Any exterior venting (vent pipe exposed to outside ambiant temperatures) should be kept to a minimum, due to potential condensation problems. This is especially important in high humidity-cold weather climates, such as maritime areas, lake shores, and low river valleys.

NOTE: Use only 3” diameterPellet venting system. Be sure to inspect and clean exhaust venting system frequently.