While screwdrivers may look like pry bars, chisels, punches and scrapers, they should never be used for such purposes. A screwdriver is most effective when its blade is straight, balanced and sharp. Misusing yours will keep it from performing best when you need it to do what you bought it to do...drive screws. Also, be sure that the handle is clean and free of slippery oil or grease.
If you own or are planning to install a high-efficiency gas furnace, ask a certified chimney sweep to check that the furnace is vented in accordance with the National Fuel Gas Code.