Had a reputable sheet metal company come to my house to give me an estimate
for replacing the main FHA trunk to a smaller height to gain some headroom
in my basement. The trunk is about 40 feet long from the furnace to the
end. The replacement height is 8" for the rectangular ductwork. The
estimate was about $2500.00 I have no idea if this is a decent price or
not. What do you think? I was a bit surprised although I really don't know
about sheet metal work, so this could be good. Thanks.
re: "The trunk is about 40 feet long from the furnace to the end."
I don't think that's enough info.
Without even discussing the location of your house (e.g. Manhattan, NY
vs. Fly Creek, Ga) which could have a *huge* impact on the price, we
don't know how many seams, branches, turns, etc. are involved.
Maybe $2500 for one long run with one outlet at the end is too much;
maybe $2500 for a 40 foot run with 14 branches and 14 dampers for
multiple zones is a great price. Hard to tell from where we're
I'm guessing that you didn't get the estimate over the phone by just
asking for a quote on a "40 foot run of FHA ducting", but that's
equivalent to what you're asking for here.
Get at least three estimates, throw out the lowest one if it's way out
of line and ask lots of questions.
Pick a balance between the price and the company that makes you feel
the most confident. Paying a little extra for "peace of mind" is often
worth the money.
8" is not custom work, that is the standard height for off the shelf ductwork.
If you have a supply house near you, you can find prices for lengths in all
the widths you need, 12", 16", 20", etc, as well as reducers and takeoffs,
drive cleats, etc. You will probably need an adapter from your existing plenum
to the new ductwork to start the run, they can supply that as well. See what
it all comes to and determine if you want to do the job yourself.
Home Depot has some of the stuff, 8x12 and 8x16 ducts in 5 foot lengths and
drive cleats, maybe a few elbows.
Might need to upgrade the furnace in any case, even if the new duct has
the same cross-section in square inches. A big square duct moves air
better than a wide flat one. Also often noisier. I'm not smart enough
in fluidics to understand why, but that is what I was always told.
I'd certainly look Real Hard at an upgrade if 2.5 k is indeed the usual
and customary price around there. When I had my furnace replaced, I had
an additional trunk added out to the addition, to replace the crappy
wall furnace with no a/c that was out there. IIRC, the 8x12 duct, about
30 feet, ran around $800 installed, not counting the separate bill for
the concrete cutting to make it over into the crawlspace. No branches,
one swept L, and split out on the end into cheap insulated flex duct.
(all they will install around here for final runs, damnit.)
On Thu, 01 Oct 2009 21:46:59 -0600, Tony Hwang wrote:
And I think it was about $40 for a 4' 16x8" run - and ten of those does
not equal $2500...
Might be worth checking building recycler yards, too - I got 8' of (IIRC)
20x8" for $5 last year, and they've always got the registers, elbows, tees
and round duct in stock for way less than HD prices.
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