I'm looking for a magnetic cover to block the shutters on the whole
house fan (from the downstairs side). Years ago, when I got my first
whole house fan, back in the days of the Sears and MW catalogs(!) they
were available through those sources. I think I remember them as being
plastic, with little magnets that attached to the fan frame. I never
bothered, because in that house, there was an actual stair way to the
attic, so I'd just go up and throw a quilt over it.

In the new house, there is also a whole house fan. Unfortunately, the
only way to the attic is through a little hatch with no fold down steps,
even. And I am *past* the point of feeling agile enough to climb my step
ladder and get into the attic myself. Let alone get back down! So I'd
like to find a magnetic cover I could use from below. I have found a few
that use velcro, but I don't want to have to leave the velcro visible
year round. (Plus I have hairy dogs, and that always does in any sort of
velcro closures!).

Any sources? The fan is maybe about 30x30? I haven't measured. OR does
anyone know where I could buy a similar sized piece of that magnetic
vinyl (sign) material? Maybe I could make my own. The ones I've seen
online all seem to be about 24".