Table of Contents
Advertisement
Outside chimneys will lead to cold back drafting when there is no fire in the insert, slow kindling
of new fires, and smoke roll-out when the door is open for loading.
On the other hand, excessive draft will make the fire uncontrollable, creating very high
temperatures in the unit as well as in the chimney and seriously damaging them. A reddish glow
on the unit and on the chimney components indicates overheating. Excessive temperatures can
cause a chimney fire.
10.8 Supply of Combustion Air
The safest and most reliable supply of combustion air for a wood insert is from the room in
which it is installed. Room air is already preheated so it will not chill the fire, and its availability
is not affected by wind pressures on the house. Almost all houses have enough natural leakage
to provide the small amount of air needed by the insert. The only case in which the wood insert
may not have adequate access to combustion air is if the operation of a powerful exhaust device
(such as a kitchen range exhaust) causes the pressure in the house to become negative relative
to outdoors.
Figure 23: Air supply in conventional houses
If an air intake is installed through the wall of the house, its pressure can vary during windy
weather. If smoke puffs from the insert, the air duct should be disconnected from the insert to
determine if it is the cause of the problem. In some windy conditions, negative pressure near
hood may draw hot exhaust gases from the insert to outdoors. Check the outdoor air duct for
soot deposits when the full system is cleaned and inspected at least once each year.
Installation and Operation Manual - Destination 2.7 Insert
Page 39
Advertisement
Table of Contents
