I make delicious Sayama tea steamed for a long time at the Yokota farm（Tea plantation management work to Protection against frost)　

When work to prepare a branch is finished, new tea is long in coming, but about the portent period of this time says damage to have by low temperature until time to pick up tea with frost damage.
A method to evade this includes “a protection against frost fan”.
I prevent damage of the frost by sending warm air of the ground to the lower direction by a method using a come-from-behind phenomenon of the temperature being caused when the frost drops.
I really need operating confirmation even if it works by the trial run normally.
A fan operates at setting temperature at the time when the fall of frost is seen or a turn and a neck swing are normalcy or there is not the damage or it does not short-circuit or checks it in electricity wiring.