There s no question that flexible duct is easier to install than metal ductwork but consider this.
Round sheet metal ductwork should be.
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Galvanized steel shall conform to astm a 653.
M1601 1 1 above ground duct systems.
Flexible duct needs to be larger than pipes to allow the same amount of airflow.
Because round ducts are inherently stronger than rectangular profiles they can be lighter metal gauges and can be installed in longer spans.
The 4 ply spiral lock seams of spiral duct create a product that is stronger than traditional welded seam round ducts of the same gauge.
Let s start with sheet metal since it has been around longer.
Above ground duct systems shall conform to the following.
20 in x 25 in x 16 in duct square to round.
Round ducts and enclosed rectangular ducts 14 inches or less minimum thickness 0 0157 equivalent galvanized gauge size 28.
Round metal duct pipe galvanized sheet metal duct work 24 metal ducts 16 inch hvac 3 inch rigid pipe.
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The fiberglass in some ducts can deteriorate with time and will eventually release fiberglass particles into the air which might affect the health of the residents.
It collects dust and is almost impossible to clean.
Minimum thickness of metal duct material shall be as listed in table m1601 1 1 2.
Master flow 4 in.
Air moves easily in metal duct systems with less friction loss.
When properly installed sheet metal systems are robust and can provide many years of service.
Sheet metal gauges used in ductwork.
Sheet metal ducts are less likely to incur dangerous mold and growths because their surfaces are non porous and smooth.
One end of each piece is crimped for easy fitting of consecutive joints or to sheet metal fittings and flexible duct.
Bob s not a fan of flexible heating ductwork.
Galvanized sheet metal ducts from the duct shop s hvac ductwork is manufactured from high quality galvanized steel in 3 foot lengths for easy handling.
The round profile greater flow efficiencies than rectangular ducts.
Sheet metal duct pipe fittings page 1 of 211.
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30 ga insulated box.
Ducts sheet metal gauges sheet metal gauges used in ductwork.
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When hanging flexible duct the hanging material should be at least.
Flexible duct can degrade over time.
26 gauge round metal duct pipe model 26cp4x24 5 67 5 67.
