This blower or drafter motor was outside the home. It was piped into the wall in between a bathroom and the utility. Nothing on the inside would give you any indication it was there…except there was a downdraft JennAir cooktop in the kitchen about 25’ into the home. The JennAir had its own motor under the stove. The motor in the picture did not come on when the JennAir was operating. I’m puzzled.
I personally believe this is a sucker motor for the JennAir. But I’ve never seen two used. One is in the cabinet below the cooktop and the other is outside. They are perfectly inline.
I have not seen such an arrangement, but I know that JeenAir does have specific (and pretty short) design limits for the discharge of their blower. So, an auxiliary unit could easily be required to make sure the exhaust exists the building.