On Sep 10, 7:19 pm, Terry > wrote:
> Gentlefolk,
>
> One stove vent actually vents to the outside. There's a couple of
> semicircular metal flaps at the bottom of the ductwork that seal it
> off when the fan is off, but they flip up when enough pressure has
> been built up from below, opening the vent and letting the nasty fumes
> out.
>
> Problem is that the flaps and the ductwork are greasy and tend to
> stick in the 'up' position. It's not much trouble in the summer, but
> in the winter, cold air pours in from the outside. I take off the
> aluminum filter, then pick and pry with a pancake flipper until the
> errant flap comes down.
>
> I attempted to clean 'em with degreaser but it's pretty hard to reach
> up there. I'd really rather not take down the entire vent from its
> ducting if there's a better way. Any ideas?

Castrol Super Clean works great, but WEAR GLOVES and BE CAREFUL.
Though if you are in Cali, I think it has been banned there.
>
> Best -- Terry

--Bryan