Originally Posted by nightmare
You're right - you don't know what it is - the company is referring to the practice called "hosing", which is tucking the hose in by the patient instead of using it with the blanket as intended. All that does is blow hot air on one spot for the duration of the case - it can cause 2nd degree burns.
Sticking the hose under the sheets will NOT cause a fire (the air coming out is about 44degC (about 111F), so that concern is unfounded. The lint question is valid - cotton sheets have lint - but the Bair hugger blankets are synthetic (paper and plastic) so they should not. I've never seen a study about it, but it's certainly a legitimate concern, although in reality it may be unfounded as well.