Any sneaky hacks for extending the furnance filter life? My hardwood engraving is real rough on them. Thinking I may increase the amount of sacrificial Merv 8-9's in the front to help slow down the wear on the Merv 13. I also vacuumed a good amount of gunk off one and stuck it back in just to see how it performs. Curious if anyone ever did anything similar. Man I'm glad I didn't go with an Atmos or something similar. I'd bleed $ in filters with what deep hardwood engraving produces, gunk-wise.