Lynnmor wrote:
Actually the motor has less to do with more restriction, just like a vacuum cleaner speeds up when the nozzle is closed off. Motor failure from less air flow would be caused by over-heating. I think the OP has the right idea, but I would use the MERV-11 filter and make it much larger.
That was awesome!! I put my hand on shop vacs all the time to listen for motor change indicating the filter is still clean. Wow never really thought about how the motor speeds up, because there is less air to move around!!
