although "thermal hood" would be the exact translation, if these are in a kitchen I think that they are exaust and fanning appliances which are set above the stove/range/cooking appliance to dissipate the heat and moisture and draw it out of the environment.

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Note added at 22 mins (2007-03-04 14:12:59 GMT)
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http://www.wood-hood.com/

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Note added at 24 mins (2007-03-04 14:14:32 GMT)
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This link is for a "thermal hood" as you can see it looks very different from a kitchen range hood
http://www.2cooltek.com/Logisys-TH202CL-Clear-Thermal-Coolin...

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Note added at 36 mins (2007-03-04 14:26:19 GMT)
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I see you posted another question and are specifically talking about a clay oven. If this question also pertains to the clay oven, it should be translated as "oven exhaust hood "
From the link below which specifically talks about clay ovens:

All tandoor ovens shall be installed under a Type I exhaust hood that complies withrequirements set forth in the applicable edition of the Uniform Mechanical Code and
the CCDEH Exhaust Ventilation Guidelines, except for the following:•A minimum of twelve-inch overhangs shall be provided on canopy hoods servingtandoor ovens.•Both solid fuel and gas fired tandoor ovens shall meet the airflow requirementsfor solid fuel burning equipment

http://216.109.125.130/search/cache?p=clay oven exaust &ei=U...

and also

www.woodstone-corp.com/pdf/cooking_wood_vs_gas.pdf

And yet...termocamino is, I think, quite a generic term. You can have it a legna (wood stove) or pellets, or gas, or whatever.

Ciao Sarah, sei sicura che il campo sia quello culinario?
Dalle mie conoscenze, i termocamini sono sistemi di riscaldamento che partono da un semplice camino a legna, il quale alimenta poi i termosifoni sparsi per la casa o simili. Certo se si vuole si può anche cucinare, ma non sono fornelli o cucine in senso proprio.