a 2.5year old that has developed a sudden fear of the ducted heating..... yep thats right the ducted bloody heating!!!!!

so DD has, for the last week and a bit, started screaming everytime the heating goes on when she is in bed, and the vent is on the other side of the room!

we dont understand whats going on, its not noisy just your typical ducted heating vent.

we have tried telling her its windy to help the birds fly- no go
we have gotten her to feel it and touch it and she is fine with that but if she is in her bed and it comes on all hell breaks loose.
ive told her its there to keep her warm so she doesnt get cold when she is asleep and she says " oh ok" and then it comes on and BAM the issues start!

its getting cold here so theres no way i can keep it off because we will all freeze but im at a loss as to how to get her to understand its ok.

has anyone else has this?

i dont want to ignore the problem or her, and last night and this morning i tried the "yes the heaters on but we cant turn it off" approach and made less of a deal, i acknowledged the problem but kept things simple rather than being excessively sympathetic to keep the fuss away but again it made no difference

HELP!