In article
,
aemeijers wrote:



How about if you can't get to the outside flapper, because idiot
Previous Owner buried it under a low deck? Mine needs cleaning, but I'm
afraid to apply air pressure for fear of blocking outside end with
debris, or blowing the flapper off entirely and making an exit for warm
air and an entrance for animals. (If deck ever gets rebuilt, there will
be a lift-out 2x2 panel above the vent...)

--
aem sends...

Can't you unscrew one deck board?