Sort:  

Yes , some are really cool. They change speed to maintain a constant air outflow.
But I'm pretty sure , one can mount a 'thermokoppel' aka thermometer inside 'the box' , so control is for constant Temperature and not for constant airflow.

Coin Marketplace

STEEM 0.04
TRX 0.33
JST 0.082
BTC 64182.09
ETH 1734.77
USDT 1.00
SBD 0.43