Valcourt FM1500 Spécifications télécharger pdf (Page 24)

Heater model installaon and operaon manual

e Relationship Between the Chimney and the House

Because the venting system is the engine that drives the wood heating system, it must have the right characteristics. e signs of

bad system design are cold backdrafting when there is no re in the stove, slow kindling of new res, and smoke roll-out when the

door is opened for loading. ere are two guidelines to follow. First, the chimney should be installed up through the heated space

of the house, not out and up an outside wall. Second, the chimney should penetrate the top of the building at or near the highest

heated space.

Why inside chimneys are preferred

Venting systems that rise straight up from the stove ue collar provide the best performance. Chimneys that rise inside the warm

space of the house tend to provide a small amount of draft even when there is no re burning. is means that when you light a

re, the initial smoke goes up the chimney and strong draft builds quickly as the chimney ue warms up. Although they are com-

mon in North America, chimneys that exit a house wall and run up outside can cause problems.

Good System design

Inside chimneys are preferred because even when no re is

burning, there is normally upward ow in the system.

Inferior System Design

Outside chimneys are a problem because when no re burns

they will go into cold backdraft if the stove is installed low in

the house.

Why the chimney should penetrate the highest heated space

When it is cold outside, the warm air in the house is buoyant so it tends to rise. is tendency of warm air to rise creates a slight

pressure dierence in the house. Called ‘stack eect’, it produces a slightly negative pressure low in the house (relative to outside)

and a slightly positive pressure zone high in the house. If there is no re burning in a heater connected to a chimney that is shorter

than the warm space inside the house, the slight negative pressure low in the house will compete against the desired upward ow

in the chimney.

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Valcourt FM1500 Spécifications Page 24