Adjustable primary air supply for wood burning device
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United States of America Patent
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-
Feb 5, 2008
Grant Date -
Dec 29, 2005
app pub date -
Jun 28, 2005
filing date -
Jun 28, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An adjustable primary air supply for wood burning device comprises at least one but preferably two thermostatic bimetal elements which, by bending with temperature variations, directly actuate a flap that opens and closes the air entry opening. Primary Air is the air used to control the burn rate and it is adjusted in order to achieve the desired burn rates and Secondary Air is the air used to complete the combustion and is not adjustable. Using these two sources of air, the invention consists of a device, which allows the primary air supply to remain open until proper burning is established. Therefore, when the temperature of the appliance rises, the combustion air gradually decreases to its preset value by having the primary air supply automatically shut off as temperature increases. A higher temperature indicates that the wood is sufficiently hot to decompose into flammable gases, so only secondary air is required to continue the combustion process.
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