Fan control and ambient temp

[MrJim007]

Hi all,
Someone asked me this the other day and I didnt have an answer.
In one room they had a log fire and up at the top of this room thay had an extractor fan directed into the next door room. The idea was that when the 'Log Fire room' got up to a certain temperature they wanted the fan to kick in and suck warm air into the next door room. They had wired the fan up to a stat but obviously when the room got up to temperature the stat knocked the fan off!!
Is there some piece of control gear that will make this work? A 'backwards stat' if you will.
Cheers.

 

[Des 56]

You can use this for function
Be warned that there are regulations regarding ventilation of solid fuel and wood burning stoves that must be checked before embarking on this project
This is not the place for competent advise in that regard

Vent axia thermoswitch
Vent Axia Sensors and Switches - Vent-Axia

 

[topquark]

See if the stat has both an NO (normally open) and NC (normally closed) connection, if it does then move the cable from NC to NO and that should do the job. Please keep in mind Des' caveats above as well!

 

[MrJim007]

Cheers guys.
Ive not been involved in the work or even seen it but I will mention these regs to him.

 

[Des 56]

Given that I also have a stove.I was interested enough to have a look at information on the net
This article may be of value to you,the paragraph headed
Airflow and convection currents around a stove

Distributing woodburning stove heat, distribute heat wood burning stoves