Overhauling my heaterbox. Repairing cracked plastic....wow it’s fragile. Don’t ask me how I know. Also if you doing this and reusing your fan blades on a new motor. A Quick way to determine which way the fan blows is to attach it to your drill before punching out the center shaft to affix to new motor. Also not that I read a post somewherethat if you reverse the wiring the fan may blow in a different direction...so there’s that way as well to be cautious of.
Did i I mention this 50 year old plastic is fragile.. F&#& !!