Can this be used to clean a cheap, portable space heater (fan blade model)?

Well, yes, however in my experience made by Century were the best. Similar price, but consistent pressure over usage. Everything else starts to crap out midway through.

How do I properly dispose of the empty can?

You may toss it in the trash. To my knowledge, it does not contain fluorocarbon, so it is not a hazardous waste.

Questions & Answers: Innovera Compressed Gas Duster

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Innovera Compressed Gas Duster, 10oz Can, 2/Pack

Blasts away dust and dirt
Perfect for cleaning cell phones, tablets, keyboards, laptops, desktops, copiers, printers and more
Includes handy extension tubes
Packing Type: Can

Out of Stock