Rectangular Metal Duct - Expected Service Life
Rectangular Metal Duct - Expected Service Life
(OP)
I'm having a hard time finding any definitive information regarding the expected service life of typical sheet metal ductwork. I'm looking at a 52 year old commercial building with original ductwork. It's all internal and serving an office environment with heating and cooling. Any clues?
Thanks in advance.
Thanks in advance.





RE: Rectangular Metal Duct - Expected Service Life
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Rectangular Metal Duct - Expected Service Life
RE: Rectangular Metal Duct - Expected Service Life
RE: Rectangular Metal Duct - Expected Service Life
- it likely is leaky hence wasting energy and damaging the building (condensation etc.), not insulated --> does not provide comfort needed
- too small for proper ventilation, too much fan energy, too noisy
- likely has dirt/mold inside since 50 yeas ago they didn't have good filters.
- not routed for the zoning you wanted
Long story short, when you retrofit HVAC (i.e. install VAV boxes) you probably will replace it and the owner should budget for that.
RE: Rectangular Metal Duct - Expected Service Life
Presumably, you're actually evaluating the condition of the ductwork, then. Does it look like it needs replacing? Ever?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Rectangular Metal Duct - Expected Service Life
RE: Rectangular Metal Duct - Expected Service Life
RE: Rectangular Metal Duct - Expected Service Life
RE: Rectangular Metal Duct - Expected Service Life
Much of the old duct work is sealed very well. That is when you need to have asbestos sampling done on the sealant, mastic and lagging.
RE: Rectangular Metal Duct - Expected Service Life
I have seen buildings with 50 years and the ducts are still in use.