I made one with concrete pouring tube. The big paper tube(pipe?) which
is used for pouring concrete pillar. Works well. From upstairs to
basement laundry room. My last house had one made of HVAC duct material.
Fire will go up the laundry chute 'chimney' no matter what it is made out
of. That is why you want a solid tight lid on the top, balanced or
spring-mounted so it CAN'T be left open. I'd also put a smoke alarm right
over the top of it. (NB- if you have kids and small pets, chute is best left
nailed shut till kids are old enough to know better and/or pet can defend
itself.) As to what the chute is made of- back when my father's company
built lots of houses with chutes (late 50s to early 70s), the chutes were
always unstained/unpainted finish grade plywood, glued'n'screwed into a
solid square tube, and put in place before the house was rocked. Never had
any problem with snags.
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