If you're adding more than one or two branch ducts, be sure to do a Manual
D, because you'll probably need to increase the size of your supply and
return trunk ducts.

"ameijers" wrote in message
...

"RobertM" wrote in message
...
wrote:

Same number of turns either way. He said it would be a lot of work to
go
through the block. I can rent a hammer chisel to cut the block and
then

cut the hole in the sill plate with a Sawzall in less time than it
takes
for the contractor to explain why he can't do it. Perhaps if I offered
him the option that he can run the duct and I'll do the work of making
the hole.

Bob

Only way I would consider running a duct like that (through finished
living
space at floor level) would be if I could painlessly bury it in the bottom
foot of a built-in bookcase or something. Yeah, notching out a block wall
and sill is a PITA, but sometimes there is no easy way to do a retrofit.
I'll be facing something similar here when I replace the
long-past-service-life furnace, and extend the ducts into the addition to
get rid of this damn secondary wall furnace. But at least I have a
decently
deep crawl space under the addition- the only hard part will be getting
through 2 poured foundation walls for the duct runs. How much does
drilling
8-inch holes through reinforced concrete walls cost again? :^(

aem sends...