Building a heater into rear defroster blower hose

Hi bohica2xo, are you talking about making a tube pipe with a heater inside with a fan or w/o fan?

Are you fabricating this from scratch hypothetically?

12vdc production units are designed for RVs and auto usage so failure due to vibration, over temp conditions and burning a vehicle down are taken into consideration in the design.

What I linked has 168 watts at 12vdc probably be running at 12.5v, so about 175 watts and contains a thermal protection circuit.

Here is a 200 watt 12vdc ceramic heater tube unit also ready to rock:

http://tweetys.com/ceramicheater12v200w.aspx?gclid=CJXFhpySka4CFQ5_hwodjiCrgQ

both units cost less than 30 bucks.

bohica2xo said

Experience tells me you need more than 90 watts.

I can do a reliable 240 watt 14v heater in a tube about 9 inches long. If you want to mount a tube heater, and use a flex hose in, and a second one out to the duct it would work.

What diameter is the duct tube?

B.

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